I respond to nearly every comment if its something to respond to. If it’s name calling and racist, sometimes I respond if it’s coherent. I have blocked a number of people if they constantly harass me, but only after I check his (it’s always men) profile. Some trolls have patterns of behavior that show they are triggered by certain topics. I simply remove myself from their headspace. I don’t discourse as long as it’s respectful and on topic. Some people are just angry and want to fight. I’m not having it.