I get plenty of good convos here- perhaps even more on a density measurement (% of good vs total) than on Reddit. But the density of bad ones is higher too. Mainly anything involving politics people are much less open minded here than on Reddit. At least on Reddit usually the person will talk to you or say they respectfully disagree, here on the Fediverse I've several times had 'heres the talking points', I directly refute them, then something like 'you obviously don't understand and I can't be bothered to explain it to you'. And while I certainly accept that I might not understand, this happens in places where their argument is 'A caused B', and my response is 'you can look it up, B happened before A'.