There's no one reason anybody does anything. Rule number one about humanity.

[He will take this beer. You do not deserve it. Also you are childshaped. He settles into a barstool with little more fuss and takes a sip for himself.]

We're mercurial things. Multi-faceted. Sometimes people drink to celebrate. Sometimes to cool off after a hard day's work. It's not always because you're down in the dumps.

Besides, it's a taste that grows on you. And if it's too bitter you can always do a cocktail — those have all the sugar and fruity flavours you could shake a stick at.