The mid-90s.
I started watching in the late-80s, I still enjoy the kid-friendly WWF shyt and the classic NWA/early WCW stuff... but when it gets to like '93-'94, I was good not watchin' most of that stuff and it stayed like that til like '97. I still feel the same way. I've seen some of the better mid-90s stuff in hindsight and certain matches/feuds were cool I guess, but I don't really have any interest in most of that time period from ANY company.
Also, I got next to no interest in ever revisiting the early 2010s.