Re: When to speak, and when to shut up!
If some intentionally try to abuse you(verbally), they will remember it or they will be happy about it(still remember it).
So
If you couldn't say any thing right away because you were in shock, no need to worry about it.
Pick any time when you are ready. Then say "what did you mean when you said that"
"No seriously , I really want to know"
"You just go around do those thing to ppl all day"
That kind of stuff.
Eventually, you recognize ppl you are not comfortable with. The moment they start talking in back of you head you will be preparing counter measures.