I think he might not be, for broad definitions of gay. ~10% of the population is out queer, and so so so many people are bigots who tell on themselves¹, oblivious weighted bisexuals², straight-in-name-only⁴, or pure spaghetti.

I propose using schoolyard bullies in therapeutic practice, to divert them from careers in law enforcement.

¹men without facial hair are tempting even me, patriarch of this church, to sin! Keep your beards up guys!

²of course I'm straight. I only have sex with my best friend when we're bored and stoned³ and have nothing else to do.

³Venn diagram with 'awake' and 'stoned' is a circle for this person. Best friend is same gender.

⁴I'm not queer. Nothing against it. Well yeah I was staring at your tits, you're beautiful. No, ain't got time for men in that way. Kissed a boy once in school,didn't see the point. Fourty years and I still haven't found a use for em. Yeah I've lived with my best friend for twenty years. describes committed affectionate lesbian relationship with lots of sex what's that got to do with anything?

That's very much not true.

What on earth are you talking about?