It's probably more a desire to help Kimmy, though there is a little of the edge, too.
They were briefly engaged to be married, but ultimately decided against it when they were in Reno.
They separated before the events of.
Her parents are very fun and understanding.
Also, her marriage collapsed because her husband cheated on her several times.
Stephanie and Jesse are the most vocal in their dislike of her, and she, in turn, teases them back quite a bit in the early seasons.