Well who is trolling who - if their overgeneralization prompts you to correct them or provide a counterexample, maybe you're already feeding the troll.
It’s trolls all the way down. This is why forms of trolling that aren’t blatant flaming get under people’s skin: it’s taking normal good-faith but ignorant user behavior and sending it into the uncanny valley. One troll shutting down a whole community is more often the case of the community having a pre-existing affinity to develop a digital autoimmune disease: once the users start treating good-faith users as potential trolls, the community turns irredeemably toxic.