It's not an online/offline thing. I might have run or played in one or two short lived online things, but I've been doing in person meatspace games since I started many years ago. The biggest changes came with the shift in tone that 5e brought along & exacerbated with regularly saying the words "tell your story". On top of the fact that both of those italicized words are a rather toxic mindset to approach a collaborative group activity there is the glaring omission of working with the other players & critical elements like making your character fit into the GM's world. As often as I've heard Crawford & such say tell your story I can't recall ever hearing them talk about respecting the GM's world even though that's like step zero in the process of discovering and evolving any kind of story with a PC.The same for me. I have a lot of floating character ideas, but I would never start fleshing one out before I knew the parameters of the campaign. That's just straight-up rude.
It definitely makes me wonder if the online focus plays a role. I only play online with people I know IRL, and most of my game time is at a physical table. I wonder if primarily online games breed a certain amount of selfish toxicity into the community, like it seems to do with most other online game communities.