Whooooaaaa. I did not mean to start a big debate or anything. I was just being kinda silly. Honest.
Re: Re: Ethnocentricity: Yes, all races are ethnocentric. It's very difficult not to be when surrounded by different ethnic groups. Each race will obviously think their own way is best - that's why they do it their way, after all. But yes, Dwarves are incredibly vocal about it. Elves are vocal, too, but usually in a snooty, down-the-nose sort of way. Dwarves are vocal about it in a loud, brash, in-your-face kind of way. But I think that was covered already.
Re: Beards: Yes, I'm fully aware that Dwarves are associated with beards (and, in some cases, that beards are associated with Dwarves). However, that doesn't mean that the "usual" Dwarven beard is the one that they all have. I see Dwarves as having a wide variety of beard styles, including some that involve rigourous shaving or trimming. ... I also just see female dwarves spending all that time on the hair on their head, rather than any hair on their chins, which I don't really think they should have anyway.
Beards tl;dr: Male Dwarves groom their beards because they're often bald on their head. Female Dwarves groom their hair because they're often bald on their chin. At least that's (one of) my take(s) on it. =P