I think things get a bit more spicy anytime an edition change-over is on the horizon. I haven't particularly noticed it this time around but maybe I missed those conversations. The editions wars between the 3E to 4E change and the 4E to 5E change were pretty ferocious. I am mostly seeing the normal levels of feuding here lately (which is to say, not zero, but for the most part nothing like prior edition changes).
My advice is try to pull back emotionally from these sorts of discussions if you are noticing patterns of behavior that bother you, and to lean on being kind to other posters as much as possible. I think a number of things happen during edition wars but something I usually sense is some of the meanness and sniping, can come from stuff in peoples lives that have nothing to do with gaming at all (and the gaming discussion seems to be a conduit for the sadness, anger or frustration they are feeling). Don't get me wrong, there are also posters who just love a good edition war. But I found in most circumstances, certainly not all, being nice to someone who is behaving that way has a much more positive effect on their posting style than when I meet angry post with an angry response (and I am certainly not guiltless when it comes to bickering over edition minutiae myself). But definitely pull away from discussions if they are stressing you.
Also like others have suggested the ignore button an be useful (even if you just need it for a day). The worst thing that can happen to you in these discussions is you see a post, it makes you angry, so you post something worded in a way you wouldn't have normally worded it, and then feel bad later. If you can, its best to either ignore those posts or wait a while before responding so your brain is cooler when you write.