I'm wondering, though, if the "seeing two men kissing thing" is even true. Maybe his dad just said that to make people think his son wasn't gay, afterall?
Or, if it is true, it could be because Dad convinced the shooter at some young and impressionable age, that "gay" is something you can catch, like a disease.
I'm reminded of a boy I dated, in late teens. He was SO homophobic... any mention of someone being gay made him feel nauseous. He complained constantly about men "hitting on" him. Said he couldn't use a public bathroom without some guy trying to pick him up. He felt pursued and attacked, but at the same time, he insisted on going around (in the late 80's) wearing tiny ripped off jean shorts and mesh sports shirts that showed his (very nicely muscled) belly. That was definitely not how most straight guys dressed, at the time. The only thing he was missing was the single earring and the bandanna in his back pocket.
His mum was weird, too. First time he brought me to his house, his mum basically shut us up alone together in the basement, like she was hoping we'd make babies, or something. Which was odd, considering he was from a conservative Palestinian family, with a dad who was a Freemason. I told my mum and she said I was the "practice girlfriend" and that boys like him didn't marry girls like me. His parents would make sure he married a nice Palestinian girl.
I broke up with him, but we worked together, so we still hung out. A couple months later, I expressed mild interest in a mutual acquaintance, and he flipped out. Accused me of being one of "those women" who come between men, and break up male friendships. Which are the only real friendships, apparently.
At the time, I remember thinking, "He's crazy! And probably gay."
It's got to be horrible growing up in a prejudiced family. It's a kind of child abuse, I think!