Why does he hate me so much?

So I guess I'm kind of friends with this boy but he seems to like hate me with a pion for no reason. I'm friends with like his best friend matthew cause we've known eachother for about a year and we started talking more this year and him and Davis(the boy) eat lunch with us and I know Matthews gf. But like everytime I'm with matthew and he's there he's like so mean to me and I don't even know why! He just acts kind of rude but still talks to me like a normal person. Monday he was kind of all over me and he was making fun of the way I talk and said it sounded like I had a d*** in my mouth and he calls me a h** and Davis is like oh Im just messin with you. And I tell matthew that Davis hates me and he's like no he doesn't hate you, he's just flirting with you. He's just a little weird. That's his way of flirting. Please help! I dunno if like he really hates me or what's going on!