You take it way too personal.
Headbanging is fun. That's all. If the band really believes that headbanging is good, regardless age, whether you think he's a glam fag or not, let him have his fun. It's not what about you are supposed to do, but Thrash MAKES you headbang, if it's good Thrash. I head bang, and I don't care if you find it a glam fag thing. I don't mind, I do what I believe in, not what I am expected to do "for my age" (I am 36, BTW.) It's just me: if you don't want to head bang because you feel too old (or "mature") for it, that's ok.
Anthrax might actually enjoy being fun, instead of just "pretending" to have fun, you know? (For it seems you think that after a certain age, headbanging/having fun is "not proper" anymore.) People of all ages should be able to jump around and headbang, regardless age-if that's what they enjoy and want. I am tired of metal that's too serious or "musical" for you. Let's have some fun, man. No need to take it as an insult to your preferred bands. If they want to stand around doing nothing, while playing "Thrash," all the power to them. I just find it out of character, much as you find headbanging as "gay" and glammish: just opinions. I clearly typed "no offense", my friend. Have fun bobbing your head; I'll have fun banging my head (it's all good.)
(Some people head-bang because it's the cool, "metal" thing to do... some head bang because they want to, and enjoy the music that way. Even though you may see all headbanging as just somebody trying to be cool, many musicians and fans do it from the heart, which is why I replied to you. That guy in Megadeth might actually do that because he wants to, not to appease some old-school metal fans... that was my point. I play bass, and if I was in a band, you can bet I WILL head-bang; not to appear "cool," but because I ENJOY IT. Again, no offense; I just wanted to defend my POV.)