If you think Blizzard have gotten worse, I have no issue with you.
As far as the playing community in-game is concerned, I think player behavior improved significantly over time. I’ve been playing my main since BC, while I only dabbled on a warrior in vanilla, and in BC and Wrath, the toxicity of any group were insane, especially for us pure DPS. I had personally experienced being yelled at because my rotation was wrong during trash pulls, tanks pulling all the trash in a room and quitting, being refused any heals because I or other DPS did something wrong that only the healer could see, being kicked from a heroic group (that I spammed 3 hours for in trade) because the tank’s guildie came online and wanted to join, getting kicked because my friend who had a physical disability (which I explained to others in the group) couldn’t “keep up” before being called names, and basically name calling and finger pointing any time we wiped.
Nowadays the worst I would get is silence. Any verbal toxicity is rare at best. In fact, the last truly toxic LFD/LFR group I remember was in LFR SoO, which was way back in MoP.