I think people boil meowrails down to the scene where Nepeta tries to avenge Equius after Gamzee killed him and use that as the prime example of why they loved each other but if you read literally every other conversation they had, Equius was incredibly controlling and manipulative towards Nepeta. I think people also use meowrails to defend Equius when his entire character is just straight up being a fascist. He constantly discourages Nepeta from associating with her friends in her surrounding castes because they are "dirty" and "beneath her". My opinions are definitely very negatively biased because I do not like Equius but I think a lot of the more toxic parts of their relationship are hidden behind "he protects her and she keeps him calm" bs