I regularly say things like this to the people closest to me. The phrasing is only awkward the first time, when I have to do a bit of backstory and explanation. Thereafter, a short phrase suffices to indicate that this sort of phenomenon is occuring.

I consider it a good intermediate rationality tactic. I'm not yet to the point where noticing that a feeling (anger, sadness) is irrational lets me eliminate it. But explicitly noting what is going on to my converational partner helps keep both of us from letting the situation worsen.