Not much. Oh, it was derided as a too-soon cash grab by WotC, and there was definite criticism of WotC for "they fixed things that weren't broken", but approximately nobody sticking with 3rd called other members of the community who were switching to 3.5 traitors. But then, approximately none of the fans of the 3.5 changes attacked those that preferred 3rd for not switching, either.
The toxicity over 3.x vs. 4th edition was a two-way street, with anyone who simply expressed a preference for either game getting attacked by the more radical fans of the other, and often becoming radicalized in turn. If the 3.x fans were visibly more bitter about what was happening, it was for the same reason the 4th edition fans were visibly more triumphant; 4th edition was the version the owners of the D&D brand were printing.
I don't think you'll see that level of warring over 2014 versus 2024, because (at least in the PHB) there's nothing big enough to inspire it. D&D 2024 isn't different enough to cause fans of D&D 2014 to say "It's not D&D anymore", nor to cause fans of 2024 to respond by saying things like "Sacred cows make the best hamburgers."
(I reserve that "at least in the PHB" because we've only seen its playtests. It might be possible that the new Monster Manual will be different enough to provoke some actual edition-warring.)