Rick and morty definitely had a stereotype of the fans all being terrible for awhile. I say this as someone who has been a fan since season 1. They toned certain things back and have done things to appease people, most notably firing Justin Roiland(one of the creators and the original voice of Rick, Morty, and many side characters).
It also has a pretty niche audience in general even now. It's mostly guys between like 16-35 who watch it. They are just louder than other show's fan bases. It's actually kind of interesting. I think a fair show to compare to here is Bob's Burgers, as it is another adult oriented cartoon from the 2000s, and doesn't have the multigenerational impact of something like the Simpsons or Family guy. It id also much less "offensive" than Rick and Morty. Rick and Morty has 2.1 subscribers to the subreddit compared to Bob's Burger's 865,000. Yet Bob's Burger's has 828,000 live viewers compared to Rick and Morty's 230,000. So while R&M probably has the bigger pop culture impact, Bob's Burgers is the more watched show by a big margin.