For me, it all depends on how gay said masks and make up are. If there is some fag up there looking like Ziggy Stardust and singing shitty music, then it's not appropriate hahaha. But I mean one band in particular for me pulls it off and thats Slipknot, I mean I don't really see the need for it, but it is part of their show you know, and since the beginning for me they have always been like that. And they play well so they have nothing to prove.
Mudvayne is similar for me aswell, but they don't paint thier faces anymore.
Then there is KISS, what the fuck?! I hate that band I think.