Yes, constantly. I don't know how some people here manage to have discussions and dump walls of text on each other at breakneck speed. For me one paragraph (of say, 6 lines) alone would be an hour of work. It's why I don't engage in these type of discussions, or bow out of a conversation when they go in that direction.
I have crippling perfectionism, and every sentence, every word needs to be perfect and grammar needs to be flawless. Since English is not my main language, and Dutch grammar works differently, this means I'm googling a lot when typing a post.
Ironically, I also find it difficult to post nothing but bite-size one-liners, or worse, only something like "lol" or "haha". Like every post needs to be at least two proper sentences long. It doesn't make sense, but that's how it is for me.
In general though, I often don't engage in discussions because I feel out of my depth and don't think it's my place to respond. I'm a privileged white dude from the Netherlands; why the hell would anyone want to hear what I think about, say, LGBTQ+ rights or, currently, police violence in the US and the BLM movement? Just shut up and listen is basically my own motto there.
Profanity is also a good example. I see people respond to each other with "Get the fuck out of here" and I don't really care. But whenever I do it, I find it comes off as super aggressive and I end up not posting it.
Lastly, memes. For example, I never know if you can say something like "feels bad man". The phrase itself is pretty innocuous, but it's associated with pepe and pepe has been co-opted by the alt-right as we all know. So would that make it offensive or not?