>>150161040
Watch the therapy scene. The therapist explains it. Nick avoids intimacy when Judy tries to get close. He deflects with dumb jokes and puts up emotional walls because he's insecure of his feelings. This makes Judy uncomfortable. Its actually the source of her discomfort and causes her to do things like tap her foot but most importantly, punch Nick. Best example was their gondola scene. She touches his arm, he pulls away and jokes about jam cams. Then Judy punches him, calling him slick because this is the only way she knows to deal with his emo walls. They keep doing this like in the scene where Nick makes fun of Judy's ears because he can't bring himself to compliment her. Again ends with a punch. The therapy scene implies they'll resolve this in Zootopia 2.