Literally did it on impulse without even thinking about it so I wouldn't chicken out, so I blurted it out.

I said "I'm bisexual. I like both men and women. No more anti-gay stuff from you, ok?".

He said, "oh go away, you don't know what you like". I think he'll understand eventually, he needs time to think.

EDIT: Showed him this thread.

I said: "Look, this is what I said to you, these are my online friends who are happy for me that I came out as bisexual."

He said: "Oh you don't know what you're talking about, you've never had sex with a man or a woman before, until then you'll never know."

And yeah, I am still holding on to my v-card at 26. I was insecure about that years ago in high school, but I'm honestly glad I've waited to mature first.