Spend enough time in the comments and you’ll notice a handful of “usual suspects” sticking out. So I’ll usually look at their profiles to see their history. If a pattern emerges, block them.
They’re usually ones that immediately jump to extremes, make bad faith comparisons right off the bat, or otherwise Godwin’s Law a comment thread between 0 and 1 replies in.
Genuine question: Is there a part of you that fears that by blocking dissenting voices, you may be reinforcing your filter bubble?