Otherwise, you're trying to make the person approaching you responsible for your internal state -- A frame I similarly have no compunction about utterly rejecting. You're responsible for your state, they are responsible for theirs.
People affect each other. I'm dubious about the moral frames which say that people ought to be able to do something (not be affected in some inconvenient way) when it's so clear that few if any people can do that.
I can see what you mean, but I'm afraid that the furthest I can go in agreement is to say that few if any people do do that (or have any idea how)*. We're certainty poverty-stricken WRT tools for taking responsibility for our own thoughts and emotions. I would argue though that that does not change what responsibilities we do have.
* BTW in a strict sense I don't think it's actually that important how you feel in response to an event, as long as you respond appropriately, just that it's useful to treat "experiencing disproportionate emotions" as a flag that one of your habits of thinking is disjuncted from reality.
r/Fitness does a weekly "Moronic Monday", a judgment-free thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. I thought this seemed like a useful thing to have here - after all, the concepts discussed on LessWrong are probably at least a little harder to grasp than those of weightlifting. Plus, I have a few stupid questions of my own, so it doesn't seem unreasonable that other people might as well.