Asking someone to stop being unpleasant
Quit your bitching. (mildly vulgar)
Quit your kvetching. (informal)
kvetching = complaining
Quit your beefing. (slang)
to beef = to complain
Quit your bellyaching. (slang)
to bellyache = to complain
Don’t be such a grouch.
Don’t be such a crab.
a crab = a crabby person = a grouchy person
Don’t be so grouchy.
Don’t be so grumpy.
grumpy = irritable; out of sorts
Did you get up on the wrong side of the bed? (idiomatic) Somebody didn’t get enough sleep.