I could do the same by pulling up a picture of someone who look stupid but is absolutely straight and cis.
That's not a problem of LGBTQ. That's a humane type of problem.
You seriously underestimate how far the human stupidity can go, in any group whatsoever.
But if your feed is filled with that no wonder why you think they are mentally ill, it's so exaggerated that it sounds satirical 💀