Why can't a guy and a girl be friends?

So I honestly still don't know how this still even happened especially since we don't really have actual conversations, but we sorta have this special bond almost like a platonic friendship. And it all started by him asking me for a ride while his car was at the shop. After that we always talk, we try to have lunch together and hangout, we were even drunk and we didn't do anything or flirting with each other, and my friends and other Co workers still thinks he might try to do something or keeps saying he likes me more than a friend and he's pretending. Why is it so hard for people to believe that a guy and a girl can be friends with no sexual feelings or liking each other?

Why can't a guy and a girl be friends?
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