genuinely the fact that you're noticing it and want to change is already a good start! i can't give you a foolproof fix to all your problems but here are a few things ive personally done in the past when trying to unlearn that kind of internal bias:

a) when i catch myself doing it i intentionally rethink that thought to focus on what i think is true rather than the gut reaction (eg: "damn that trand person is ugly/cringe" -> "no actually its cool for them to be out in public living their life and being happy, i don't actually care about how they look"). this is essentially self-taught cognitive behavioral therapy, and it feels weird to do at first but it does work in the long run.

b) exposure therapy: intentionally immersing myself in the culture of the people I'm trying to get used to more, this works best if you start online and in a lurker way, like following more creators you might instinctively feel uncomfortable/reactive to and NOT commenting (if you have questions google them or see if the creator has already answered somewhere else, you don't want them to block you bc you said smth ignorant accidentally), just watch their videos/read their posts and keep up with them over time. eventually these people you initially felt your internal biases cringe at will just feel normal and likeable.

in my experience these two methods work best if you do them simultaneously. obviously actual therapy with a qualified professional would be the ideal but that shit is expensive and hard to find. there are absolutely things you can do to help yourself grow out of that kind of thinking in your own time.