Dude, I'm not stupid. I know what a homosexual act is. Linking a definition for me from a law dictionary is neither helpful nor necessary. I was also a Marine, a 0331 machine gunner in the 4th Marines until after I graduated university and accepted a commission in the Air Force, a commission I resigned after I failed a routine security-clearance polygraph. The question that caught me up was whether I had "knowingly engaged in any homosexual acts as an adult."

I indeed knew what homosexual acts were. That's why I failed the test. I still know what homosexual acts are, which is helpful in my sex life as a gay man.

I was not disputing the nature of homosexual acts with you. I was disputing your suggestion that the young man in question is "undeniably homosexual, either in denial or the closet."

Receiving a blow job from a woman (whether she's cisgender or transgender) does not make a man a homosexual, either an "undeniable" one or otherwise.

I guess it's possible this guy secretly knew she was trans, all while expressing horror and anger at the possibility, and that he secretly wanted to engage with her penis even though the facts of the incident as reported strongly suggest he didn't touch it or know about it at all.

Sex isn't magic. A man having a sexual encounter with a transgender woman he mistakes for a cisgender woman doesn't turn that man gay. That's not how any of this works. Sex isn't like cooties, and you can't catch the gay from a blowjob.