While I had this issue a whole year ago, it's intensified a lot these last weeks: People just don't want to lurk and understand the place. I see people calling communities "subreddits", not reading the rules or basic purpose of the site before signing up and posting and complaining when they get banned, someone asking completely off-topic things in /c/linux, people reacting to titles and not reading the post, people commenting without reading other comments. Especially people coming from popular subreddits and streams where being perfectly redundant is acceptable. If you agree with something and have nothing valuable to add, use the voting instead of burying everything by reposting the same thing twice! That, and the extra aggression we've seen, especially with people getting culture shock from the politics but just in general.
It's a general attitude of arrogance or uncurious ignorance and it's hard not to be offended, especially when some of us came here, in part, to get away from that culture.
Also, the normalization of pro-capitalist attitudes is a huge bummer. A non-trivial chunk of people trying to rationalize Reddit's actions as 'just a bad CEO' is unfortunate to see, that narrow-sighted denial of systematic factors and of what makes this ecosystem act differently, it's unfortunate especially on lemmy.ml which until recently was explicitly anticapitalist.
Again, this isn't completely new, but it's suddenly become a huge issue which may no longer be manageable without either mass action calling out inconsiderate attitudes, or harsh moderation.