(well,) pardon me for breathing!

An angry, exasperated response to a criticism or rebuke that one feels is unwarranted or unjustified. A: "Would you please just sit down and stop trying to help? You're only getting in my way." B: "Well, pardon me for breathing!" You don't need to get so upset, I was just suggesting you ask for directions. Pardon me for breathing! Well, pardon me for breathing! I was just trying to be nice—you can get your own coffee next time.