When you find yourself frustrated by someone's actions.
Stop
Take a deep breath
and remind yourself: It's Just RP
If someone does something that pisses you off, don't fly off the handle on them right away. Remember this is just role-play, we can't get people to do exactly what we expect them to do or how we imagine them doing. Just step back and vent to yourself or vent to someone who is in no way related to what's going on so you can get it out of your system so that you can address the issue relatively maturely.
Venting to the wrong person can result in the spreading of gossip and rumors and unneeded animosity long after you've gotten over it.
You can be calm and do something within a RP and suddenly that person you were venting about comes back with a ((OOC: Oh should I just let you put me in that hold or are you going to complain about me slipping out of your submissions all of the time again?))
If someone is Munching or interrupting things gather your calm then take it to the PMs, no one needs to see you bickering over the RP. Talking it out is useful as you can see why they may have done it and maybe help someone out or see things differently that will help out your RPing development.
If they are basically being trolls about it then take it to the mods.
Don't let a petty fight ruin a RP, your fun, or the fun of your RP crew.