I kind of agree, but I have seen 2000 players make dumb mistakes too.
1800s do dumb mistakes as well, but the chain can keep up therefore I think we cannot objectively say what is a good rating or not.
In fact I think what is a globally good rating is something that we don't need to know. It's pointless. 1800 is a good global rating. So? How does that change your chess? If you want to become CM and end up a 1800, you won't be happy will you? If you want to become a 1500 and you become 1800 you'll be delighted
The club I most actively played for is topped by two masters, followed by two coaches who work hard at correspondence. At least two of the top twenty are OTB B class. Lots of FMs and NMs who underperform.
https://www.chess.com/clubs/members/team-washington?sortType=rating
In one of our team matches I beat a NM who was playing 75 games and was in elementary school. There is no doubt that he was spending far less time on the game than I was. I had six games going and plenty of free time.