gaffe, slip, gaucherie, solecism, mistake, trip, blunder, error, misstep, floater, more...

etiquette

interrupting, not apologizing, not RSVPing, more...

gone wrong, bad, beef, whoopsy, titanic, bungled, botched up, teen, trip, gone bad, screwed up

social blunder,   faux (blunder),   etiquette breach,   pas (mistake),   social mistake,   embarrassing thing,   social no-no,   fauz pas,   social mishap,   social errors