We are already biologically predisposed to be repulsed by any attempt made to blur (or outright eliminate) the differences between male and female, to the point where even putting on clothing intended for the opposite sex will trigger that fear/disgust response. And contrary to what leftists will tell you, there’s a damned good reason for that. Nothing good can come from willfully ignoring the differences between men and women.

For instance, dating, romance, sexuality. Most people, like it or not, will much rather date someone who looks reasonably healthy for their sex.

Androgyny, at best, indicates poor physical health and/or infertility. At worst, it indicates an attempt at deception.

This is especially true within the “trap” subculture, where the goal is to pass as a female as much as possible, usually without the use of surgery or HRT. This is especially in regard to trying to “trap” straight men or lesbian women.
Even if the people who practice such a lifestyle don’t actually go that far, the implication is every bit as horrifying as you think it is. It’s horrifying because the LGBTQ community doesn’t see anything wrong with rape by deception. They already believe that being a sex pest is intrinsic to being LGBTQ, and so they will call you a “homophobe” or “transphobe” if you call them out on such behavior.