You can tell who’s laughing with you and who’s laughing at you by who checks your face afterward.

Laughter is ambiguous and the follow-up look is not. Someone who glances over to see how you took it has kept you in mind as a person throughout; someone who does not has been using you as material. That half-second is the most reliable social signal you will get, and it is almost never faked.

Start watching for it and you will read a room faster than any amount of analysis. Do it yourself too, especially when a joke landed harder than you meant. Checking a face costs nothing and tells the other person everything.