Men who, on date one or two, come out as bisexual to me. They either list themselves as straight or imply it until we're out, and, gee!! I wonder why I inspire this need to disclose

!!! Like, dude... I am so much a straight woman that it literally makes as much of a difference to me as it did to your cis ex girlfriend..... well, actually, it does make a difference! Because now I know that telling me this is because of me being trans, which is othering, demoralizing, and immediately kills any chance for a follow-up date.
I have dated bisexual men, but they were out and open about it before we dated, and our dating was purely heterosexual, if it crossed that boundary, it ended. A guy being bi wasn't a deal-breaker, but my particular lot in life "inspiring his bisexuality" is not ok with me. It's getting to a point where it is a red flag and I am avoiding them as potential partners. Which is sad, I know that bi men struggle a lot, but that doesn't excuse these transphobic encounters, or boundary crossings. If it's such a trend with that demographic, then I might just have to not get involved with them, unfair as that may be.