Passive aggression can be traced back millions of years to (recently discovered) cave paintings of dishes with question marks next to them. The tactic has been key in shaping our culture -- did you know the North won the Civil War was because Robert E. Lee decided "it was whatever"? True story. We've found some hair-pulling examples of our great social pastime to help you in whatever petty argument / culture-shaping discourse you've found yourself stuck.
Say it, don't flambay it.
Passive aggressive PLUS some guilt sprinkled in, nice touch.
So many trees died for these roommates to avoid face to face confrontation.
NO YOU'RE OUT OF ORDER, THIS WHOLE FINANCIAL SYSTEM IS OUT OF ORDER!
I wonder if he got the signal.