I would expect that what happened in Paris would have been on Brad's mind when he was dealing with Will. When he left Paris, his son had just been molested and was dealing with that, and had all but broken up with his boyfriend. He was a pretty morose guy. So he shows up at home, back from Rome, pretty much like his old self. They surf, and then he's joking around with Brad, they're having a good time, and they're communicating openly. Do you really want to bust his balls too hard after all that crap? Or would you be so glad to have your son back, pretty much like he was?
As far as Stef and Brad go, those two like drama that involves other people, not each other. Their conflicts have been sparse, very sparse. The only outright fight I remember them having was when they were going out on the boat (in BeRad) after they rescued Jake, and Stef was fawning all over Jake.
I think it's going to be interesting to see how they handle JJ and Will, since they will have to handle them differently. The thing that will probably save Brad, Jeanine, and Robbie from being completely unfair is that JJ's skating will dictate much of what he can and can't do anyway.