Hate: when I land an aircraft and some dork proceeds to refer to the landing as a 'crash'.
When I touch down on a hidden beach with my Lambda and then offload a squad of soldiers who then take a CP, that is to be referred to as a landing. Just that the only three things you can do with an aircraft is lift it off the ground, fly it and crash it doesn't mean that every other instance of an aircraft coming into contact with a surface is a 'crash'. I don't care if I took an EMP hit on the way down, when a Lambda slowly loses altitude with its wings folded until it touches the ground that's called a landing.
(...and yes, I've got other examples of this happening, too)
Hate #2: playing Endor Strike Team and getting massacred trying to take that damned Bunker CP from the Imperials. Sometimes it's just impossible, especially when attacking SL's don't use spawn beacons or their other abilities.
"One of the bitches actually gave birth while she was attacking, and her puppies joined in on the carnage."
--the awesomeness that is Boatmurdered.