[Boomer]

That phrase, and it's equivalents, ALWAYS precede an attempt to deceive.

Coming from the left it does for sure. I've used it back at them to debunk their nauseating assertions.

[NorthMountain]

I avoid it because it implies previous dishonesty, it sounds smarmy, and because (in my limited experience) it precedes actual dishonesty. IMHO. YMMV.