You get what you settle for.
This comment is actually directed towards Thelma, who has settled for a marriage that is extremely loveless and unhappy. Thelma is a housewife and bullied by her brash, abrasive husband Darryl, who speaks to her without any respect whatsoever. It is starting to weigh heavily on Thelma. Louise would like to see her friend getting away from Darryl and she believes that Thelma has the life she has because she was willing to accept it and settle for it instead of looking for something better.
Where do you get off behaving that way with women you don't even know? How'd you feel if someone did that to your mother or your sister or your wife?
Louise is filled with rage when she finds Harlan trying to rape Thelma but she is almost more enraged that he shouts back at Thelma that he "should have fucked her". This, to Louise, is almost worse, and more disrespectful, than the initial attempted rape because Harlan has completely dehumanized Thelma and does not think of her at all as a person, with a mother or a husband or a brother of her own. Louise is angry because he is behaving differently to them as strangers than he would if they were women that actually meant something to him and that is what she cannot forgive him for.
Now, I've always believed that, if done properly, armed robbery doesn't have to be a totally unpleasant experience.
Hitch-hiker J.D. is a convicted felon, thief and parole jumper, and as well as falling hard for him, Thelma also learns a lot from him in a very short space of time. He likes to talk about robberies he has committed in a theoretical kind of way, and this is very helpful to Thelma when she decides to hold up the convenience store herself. She draws on the lessons that he has taught her to make sure that the experience is not unpleasant for her "victims" either, realizing that what he has told her is going to enable her to be a better thief.
