Can i just point out that everyone was once an inexperienced player.
Sure :) (I hope that everyone includes me as well).
How are the inexperienced players meant to learn how to use the tanks n stuff if all you experienced players bitch everytime someone trys to use one, everyone needs to learn how to use them so quit bitching when you dont get your favourite tank.
I guess I'm considered an "experienced" player, but I don't use vehicles if I don't have to (with 2 exceptions). There only 2 vehicles I will occasionally whore, the goliath in MB and the Ion in MTMU, but if anyone ever asks to drive or complains, I stop using it for the rest of the match.
Now on the "but how am I supposed to learn excuse"... This is one of my pet peeves. UT2k4 was my return to the FPS genre, and I started off as bad as one could possibly be. My skillset was limited to mini, avrils, and mines. I slowly improved to be an average ONS player, and then I discovered spectating. Today the vast majority of my knowledge, skills, and tactics is due to spectating other players:
Flak primary - Urtho
Flak alt - Cornholio
Shockcombo - M1lkshake
Shock primary - Rider
Rockets - Cyrus
Lightning gun - alpha
Tanks - Jdub
Ion tank - Cornholio
Manta - Chococake
Cicada - 5thSymphony, Conviction
Biorifle - ???, Pixie, Riddick
Movement - L10Alton, Various others
General ninja tactics - Urtho, Pi, Choco, etc..
Grenades & spidermines - online videos
Aim/Keybinds/Mouse tweaks - various pure. members (they have some very helpful guides posted in their forums)
Countless other tricks, tips, & tactics - Everyone
I went from as bad any ut player could ever be to average on my own, but it took spectating, a willingness to learn, and changing old habits to improve after that.
As for people's bitching in general, just press esc, right click their name, and ignore their voice and text.