Aw, your kids like it. My college boy loves to come home for the weekend, even if he doesn’t spend a ton of time hanging with me, he loves to be near us. We are like water on a rock. It APPEARS we have no effect, but over time, we do slowly shape these guys! You’re a good parent.
The grunts distress my wife, but I tell her its just a phase - nearly all teen boys go through it. Later on, when they are older and out of the house, their attitude will turn around and they’ll realize that mom and dad did right by them, and in turn, they will be good parents, in all likelihood. They just cannot ignore the years of love, especially when they find out what the real world is like.