How is that guy who created  the super straight trend is transphobic?

I think it's kind of high-concept regarding sexual attraction in the same way as erotic transvestism is.  If you're attracted to someone of feminine appearance, that's a given fact.  If you later go off them because you find something out about them, that's not really any different from being disenchanted with someone when you realise he spits when he speaks or has an annoying laugh or dress sense.  Those are not sexual orientations.  Someone who is "superstraight" is just experiencing a "yuck" factor like that.  It also kind of feels like they think they have some kind of perfect trans person detector, and they don't.

He wasn't transphobic but he was proving that sexuality is a choice.

As if it wasn't he wouldn't be choosing to be grossed out by what the person used to have also it's none of their business what they used to have it's a violation of their right to privacy for him to ask that.

Anyone who demands you be attracted to or have sex with them or you're a bad person is an INCEL.

Such men will claim they aren't attracted to trans people, but that's a lie. Trans people are hit on all the time by these guys. The fact is you usually can't tell who is trans and who isn't just by looking. What happens is once these guys find out a person is transgender their PREJUDICE kicks in. Science and common sense tell us that transgender people are who they say they are. But these guys don't accept any of that and have an irrational response to trans people; one that screams insecurity.

Clearly you're the one being "overly sensitive" at this point.  Let the barflies banter.  It's meaningless.

Irony. When you are calling other people overly sensitive and you are defending the person who felt the need to create "super straight".