Identifying as trans usually means you're a straight homophobe
I tried to make sense of this line and failed. If you assume that gender identities aren’t real and trans people mostly date people of the same birth sex, then being self-hating *gay* homophobes is a “reasonable” conclusion given the premises (but not the only possibility). If you assume that gender identities aren’t real and trans people mostly date people of the opposite birth sex, then self-hating straight *heterophobes* is a likewise “reasonable” conclusion. If you do believe that gender identities are real, then I’m not sure what sort of misunderstanding would result in the particular combination of “straight homophobe”.
The only things I can come up with is that this is derived from a mashup of two different ideas which “make sense” from the point of view that gay/lesbian people are real and trans people aren’t, but they failed to notice that said ideas were mutually exclusive in some respect… or else maybe they have a really strange concept of what “straight” means.
Regardless, it appears that trans people are approximately 30% straight, 30% gay/lesbian, 30% bisexual, and 10% asexual, so assuming that trans people “most commonly” prefer date people of either sex and/or gender in particular is an incorrect premise.