Let me begin by stating that "not liking" is not the same as "strongly disliking." I don't know that there are any guns that I strongly dislike.
That said, I have learned that I don't really like lever actions. The first centerfire rifle I owned was a Marlin 336 in .30-30. I sold it to buy my first bolt rifle. Since then I have owned several other .30-30s, including a very nice 336 Texan, and quite a few 1894s in .357 and .44 magnum. In every case I started out thinking, "Lever actions are just so cool!" Then, after playing with them a bit--slicking them up, trying different optics from peeps to scout scopes, etc.--they lose their luster very quickly and I sell them off to buy something else. I have concluded that I don't care for lever actions. I'm still a sucker, though, and might try a Henry Long Ranger sometime ...
1911s. Everybody should have one, right? So I did. I really wanted to like it. I tried two different models: a Rock Island GI and a Springfield "Loaded." They just didn't point well for me and the bug never really bit. So they are gone, too. I know a lot of people don't like Glocks--but Glocks fit my large hands and point well for me. So I wouldn't say no to a 1911 that someone gifted me, but I'll not go looking for another one.
And honestly, I don't really care for the AR15 platform. I have one that I shoot occasionally, but I much prefer my bolt action rifles.