1.older drummers that are stuck in the 80's playing style and don't want to let drumming go....lol, (I mean give it up, you had your prime 20 yrs ago)
2. percussion players who don't know how and when to play and have a setup thats bigger than your drumkit, and more cymbals than the drummer ie. they play congas and bongos real loud to be heard on the slow worship songs.... and then when the leader breaks the band, and signals for the drummer to keep playing wit the MPC, the percussiinist thinks its his time to shine.......

3. muscians who don't have that musical approach to the songs they play, everything must blast loud as jacks or they don't feel like they done the instruments justice. ie: a drummer once told me you ain't playing drums right unless you're busting heads and got stick chips all over the place or breaking cymbals and sticks.....so whack, again they're stuck back in the day (stubborn)
4. muscians who make the uglyiest faces and sound terrible, i think there smelling there own playing....lol
5. when someone other than the MD or bass player tries to tell to play louder or give them more...lol, I mean who are you? if you were capable of doing it better you would be in my seat, and then after the set everyone is giving props or whateva and that person is looking stupid because you payed them no attn, and you get a kick out of ignoring them and then you ask, what were you saying...lol
just a couple of my cents....