I don't dislike anyone on the show. There are times when a character will do something awful and I hate that they did it, but I never hate the character. I went through cycles where some characters annoyed me more than others, and Don was at the top of that list. I thought Pete was a spoiled brat for most of the show's run, and only thought about himself and his own needs, but I agree with Sister Magpie that he had one of the most believable arcs on the show. There is no one thing that makes Pete realize he's been acting selfishly, and I think that's very true to life. Peggy never grated on my nerves the way she did for others. I think that's because I am also an introvert who just wants to concentrate on their work and do their best. Joan could have a Queen Bee attitude that turned me off, but I think the show did a good job of showing us why Joan could be like that. That's what she was taught, and that's how she learned to rise to the top in a male dominated world. I understood it. Betty did her share of awful things, but she was too repressed and damaged for me to hate her. She broke my heart, more than anything. Roger could be a shit, but he added a lot of color and humor to the show, and he was just too damn charming to hate. I even had moments where I kind of liked Harry, lol. So, whenever I do a rewatch, I experience moments of disappointment, exasperation, and annoyance with the characters, but there isn't anyone I loathe, through and through. To me, that's the beauty of this show, no one is good and no one is bad. They're all heartbreakingly human.