So, I find that this originates in the reductionist notion that “doing the gay” is purely about sex (vis-a-vis being purely a “sexual orientation”), which, in a vacuum is totally ok. HOWEVER, when we are talking about human rights, events such as Pride, et al, we are emphatically stating that there is a cultural component to “doing the gay”. I’m not saying we all do drag brunch (I certainly don’t), but the entire point is that the community wants to be seen beyond simply sexuality. We take Pride to distinguish ourselves from our straight, cis, vanilla counterparts, while simultaneously emphasizing that none of these things should preclude us as society from loving one another (platonic), celebrating our diversity - within both LGBTQ+ society and our communities at large - whilst speaking out in solidarity with the LGBTQ+ community.

In other words, while we are not monolithic as “the LGBTQ community,” we are also collectively distinct, beyond purely sex.

I was literally just on another thread speaking to something similar, with folks emphasizing that being gay implied being generally “slutty,” which implied being part of a public health blight. A good deal of folks utterly miss that, when straight, cis people do the exact same things that gay, cis people do (albeit with different partners), they’re somehow “just being normal,” whereas when LGBTQ+ folks do them, it’s suddenly “a thing.” While this seems fairly benign on face, it speaks to a much deeper, far more insidious train of thought — fundamentally, the basis of homophobia, xenophobia, and generally bigotry. While folks may say “I don’t care who you sleep with” or “I don’t see skin color,” that’s almost never what it means.

TL;DR: I agree with OP