My personal favorite as of late, but I usually reserve it for nuclear situations, since it can cause some serious unrest in some folks: “The Jerry intervention.” It goes as follows:
Person A says something backhanded, passive aggressive, or anything I find condescending or irritating.
I muster an exasperated/disgusted/contemptuous look (it varies on the situational needs), or just roll my eyes, and say, “Man, Jerry was so right about you” and walk away. The key is to pick a name of a person who isn’t in your company, friend circle, or family. They’ll start doing an internal search, trying to figure out who the heck Jerry is, what they did, and what Jerry was talking about. Best yet, that lovely feeling of vague insecurity is now attached to their behavior, and they’re (theoretically) less likely to broach topics of conversation that would flare that again. All credit goes to my hypnosis trainer for this one.