“My boyfriend says I’m not allowed…”

Nope, he doesn’t get to decide what you’re “allowed” to do. He doesn’t have authority over you!

Sounds like you both just have different perspectives on alcohol, and there’s no right or wrong. Personally I only drink with other people because I see it as a social thing, but there are plenty of people who enjoy having a drink at home in the evening. The only thing that’s wrong here is the fact that this is an argument and not just a difference of opinion.