I'm the polariser with some of these others I fully agree with:
Dead rags, useful if everyone is is aware of them and uses their eyes; when on a milsim etc. and training plates in a plate carrier do make it hold shape and sit on your body better.
I don't use a "ghillie" I use a hood which covers my head, shoulders and back and I can tell you now you still feel a hit through it however I agree there are some leaf suit wankers who think even though you've shot them it wasn't for them so don't take it.
high caps, I use 35rnd mags due to the MWS life and haven't used full auto in a game in years and I agree it's annoying when your shot gets blown or knocked off target however it would definitely make people play a complete different way; i.e. not full auto and walk the bbs onto the target. I can't stand it when it's been agreed everyone uses mids or lows and them some wanker appears with high caps. how much ammo are people using throughout the day? Woodland I maybe do 600rnds a day and CQB 1000 if I'm really trigger happy which is like 4 mag refills, one after each game, I am carrying less than 2 midcaps of ammo at any one time any more is unnecessary.
Box or drum mags that aren't on a support gun (ARP users I'm looking at you).
Rubber knives, just another thing to lose which can be swapped out with a simple hand on the shoulder then you don't have the problem of people being stabbed by coldsteel training knives which are rock solid.
Any form of camo in an urban environment, your DPM isn't fooling anyone.
Any hop up chamber which requires a tool to adjust.
cheap BBs which shatter upon touching any surface
PEOPLE WHO WE DON'T NEED IN AIRSOFT
Those who say "I won't spend more than £20 on any airsoft kit because it's only airsoft" when you ask me what my kit is and how much it costs then proceed to poke fun at why I spent over a grand on what I'm wearing and using, then proceed to moan about your kit falling apart during a game. JUST BECAUSE SOMEONE HAS MORE DISPOSABLE INCOME THAN YOU DOESN'T MAKE THEM A BAD PERSON.
The people who have no time keeping ability, if a briefing is due to start at 10 and you wander into the safezone at 9:45 you're stopping everyone else's day.
The people who feel it necessary to shout orders at random people across a site, +10 if they did cadets in 2001 and therefore they've "got military experience and training".
We sell a lot of new Land Rovers it's not just airsoft.