Hate Jerry's parents.
I should say I hate almost all the episodes involving Jerry's parents. The humor is not funny to me. The fact they don't want Jerry to pay for anything and the interaction. The only episode I half like is when they reveal their distain for the Costanzas.
I know Jerry is targeting his experience with older retired Jewish New Yorkers living in Florida. Their quirks and foibles. The Jewish mother syndrome etc. Just not very funny to me and their presence in an episode takes away what is really funny about the show.
I especially hate the character of Jack Klompus who is tied to them. I guess you are supposed to hate him that is the idea. He is a jerk but he is so irritating and infuriating he makes it worse.