If you want him to shave off the hipster beard, you need to tell him to shave off the hipster beard.
My philosophy regarding a guy's facial hair is as follows: If the guy is single, it's his call. If the guy isn't, it's his girlfriend's call. Guys wear facial hair for the same reason they do everything else - to be attractive to women. But if they've already attracted a woman, then their new goal should be to try and keep her. And their actions and facial hair choices should reflect that.
Given this, my advice is to tell him the truth and keep it as straightforward as possible. "I find you a lot more attractive without the beard, and I really want you to shave it off." Tell him that you don't want to be bossy, but you have a clear preference and you want him to know what it is. It doesn't have to be any more complicated than that. If your boyfriend is smart, he'll do what you're strongly recommending that he do.
Spell it out and don't feel bad. Good luck.
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