This has been the opposite of my experience, unfortunately. I think the smaller population of the Fediverse seems to result in a more insular community. I see the same names cropping up in many disparate communities, whereas on Reddit I never bothered learning usernames because I rarely met the same people twice.
I also get downvoted a lot more here, which was rare on Reddit. I haven't consciously changed my opinions or writing style, and I am still active on Reddit as well, so I don't think it's just me.