I think we need to consider the norms Lemmites enforce. From what I’ve experienced: it’s often nitpicks (“I think one thing you said is wrong”), or mild insults when an opinion is outside our slightly-left-of-centre POV. Disagreement is rarely friendly, gentle, or constructive.
From what I’ve seen, we’re great at getting the big stuff right - people react quickly against child porn or overt racism/insults. But we reply with the same anger if someone has an opinion different from ours.
I have a better time in small Reddit communities because people have more shared interests. Here our prime commonality is that we like FOSS and dislike Reddit.