I think there is some valid complaints to be had against being swarmed by fanatics on Lemmy but there is no way it’s more toxic than Reddit. For the most part I’d say the community is very much the same between the major Lemmy instances and Reddit. Just with more FOSS evangelism and Linux love.
I’d say that Reddit was the exact amount of leftism. Just with more “orange man bad” in addition to the anti work/late stage capitalism bend as Reddit is more USA-centric