I don't think stereotyping was behind this comment. Muslims are not supposed to drink alcohol.... " Sigh"... I am sure your Muslim friend is a good man, with a wonderful family. Alas Muslims are not supposed to drink beer.
And Hindus are not supposed to eat beef, Jews are not supposed to eat non kosher food, so what is your point? These are religious directives, which some people obey, others don’t. I have a Hindu friend who just loves hamburgers.
Indeed, that is what I mean by stereotypes. Just because Islam forbids alcohol, doesn’t mean that all the Muslims abstain from alcohol {same as just because Islam regards women as sub human doesn’t mean that all Muslim men keep their wives in chains). In fact, we have a doctor friend who worked in Saudi Arabia for a few years. He tells me that in Saudi Arabia, they have wards in hospitals devoted exclusively for alcoholics.
If alcohol is forbidden in Islam, where do the alcoholics come from? Different people are religious to different extent, some not at all, and still they call themselves Muslims, Christians or whatever.