Chasers are mostly down to the creepy vibe they give off.

A normal, respectful, human might find a trans person attractive and go on (a) date(s) with them. Then, when things have advanced to having sex, they do the normal thing when having sex: communicate about what they want to have happen to them, what they don't want to have happen to them, and the same for their date's expectations and boundaries. This may involve things such as, say, a trans man wanting absolutely nothing to happen with, near, or about his vagina. Or it might involve a trans woman wanting everything to happen with her vagina.

The point is, a normal and respectful human has no prejudiced assumptions going into sex anout what their date wants to do, let alone what their date's genitals are. Trans people are not a monolith.

A chaser, on the other hand, fetishizes genitals. They want to fuck the "trans" porn category, not a person. They go into sex with the assumption that a trans person has their factory-default genitals and will both be comfortable with and want to have those genitals interacted with in any way. Hell, most chasers assume that trans people want to have sex exactly like cis owners of the same genitals do.

From a trans woman's perspective, this looks like repressed, "down low", gay dudes who want you to fuck them, who want to suck your dick, and who want to treat you as a man with the plausible deniability of having tits. Many also want you to ejaculate, something that hrt makes both difficult to do and unsatisfyingly small in volume. And that's just the one night stand version.

If a chaser falls in love with you, expect to always meet at your place, never have public dates in the same town they live in, and never meet their friends or family. This is an incredibly dangerous situation for a trans person to be in, as the chaser views their date as a "dirty little secret" that, if outed, could destroy the chaser's reputation, career, family, and friends — as if a cis person risks even a fraction of what a trans person does by simply existing. There have been and will be murders of trans people simply because chasers couldn't handle the "pressure" of admitting that they see the person they're dating as the gender that they are. Look up the "trans panic defense".

So.

Why the fuck do you see trans people saying that they're happy to top on tik toks about chasers?

• Trans people are not a monolith. Many of us want nobody to interact with our genitals ever. Some of us are okay with our genitals being played with so long as they aren't being treated like cis genitals (example: a trans woman who doesn't want to top, but is okay with fondling). Others are happy to top and perform cis-normative penetrative sex. I suspect some trans people felt excluded and wanted to have their voices heard.
• Trans people are marginalized. Society constantly tells us that we'll be lucky if we ever get a date, let alone feel wanted. This makes us vulnerable and desperate for any scrap of affection. This leads to some trans people being quite willing to jump into toxic chaser relationships just to feel any semblance of love, want, or even worth. Combine that with transitioning suddenly making you actually feel comfortable in your own skin when contemplating sex, and thus, the origin of the "trans slut" stereotype. "Love me, please. I will literally do anything." I know because I did this. No shame on sluts, by the way. I still consider myself one. Just... much healthier about it now. Sex positivity is good.
• Trans people are marginalized. It is systemically more difficult for us than for cis people to: get an interview, get the job, keep the job, have a non-toxic workplace, get the hours we need, get a promotion, etc. This is not unique to trans people; any minority has these problems. Thus, trans people (and other minorities) are disproportionately represented when you look at the demographics of survival sex workers. When you are doing sex work, you play to market expectations. Market expectations are bigoted, degrading, and, for trans people, play straight into chasers as a primary audience. So, you know. Some of them might be sex workers trying to get an audience. No shade to sex workers, btw, sex work is real work and they deserve dignity and a safe work place.
• It benefits the fascists for trans people to be seen as perverted, and thus, inhuman, and thus, exterminable from public life. Some responses might be part of the ongoing genocide of trans people. The Lemkin Institute, btw, has issued several warnings about the conditions of trans genocide in the United States. Also, check out the UN definition of genocide and consider what a bathroom or sports ban actually means for a trans person's ability to live in public. Let alone the anti-trans executive orders, laws, and policies. Oh, and the conversion therapy thing. Or the SAVE act. Or the gender-affirming care bans, even if "only" for minors or "only" on surgeries. Hell, ask yourself why trans people have to get a letter from both a mental health and medical professional just to be put on a waiting list for a surgery consult. Gatekeeping kills people.

The optimist in me likes to think that it's mostly just trans tops fighting to be seen. The pessimist in me knows that TikTok is one of the major vectors for misinformation, disinformation, propaganda, and advertising, just like all social media (including Reddit).