"Yeah I might now that the school year is over." Yeah no, if Bart quit sports he wasn't going to replace it with something else-- he was going to go home and play video games, or do Kid Flash stuff. Or hang out with Kara.
Bart didn't actually frown at Jesse's answer. He wasn't stupid. He knew she was hurt the same way that he hurt over his parents-- and hers was still fresh. But he didn't really know how to tell her that he knew what she meant and that it was okay.
Instead, Bart zipped around behind the kitchen counter and gave Jesse a surprise hug, leaning his head against the side of her shoulder. "It's okay to be sad."