On boys who think they're funny and miss that it's not funny to make jokes at the expense of others: keep an eye on it. I'm married to one of those. He used to think it was really funny to make jokes about me in front of my family or his family. He'll exaggerate and lie if it suits the story that he thinks is funny. He still doesn't understand why I get so upset when my family is laughing about me. (Yes, I've got my issues but I really resent when he just makes stuff up, like the time he told them I had 67 rules and he'd written them all down. There weren't 67 and they included things like "close the door so the parakeet doesn't fly out" and "use the dish towel for drying dishes but not hands; use the hand towel for drying your hands." If he had any common sense (like duh, don't wipe mustard off your hands onto the towel we use to dry clean dishes), there wouldn't have been as many as there were. But my family went on and on about how I'm so controlling and such a perfectionist and there's nothing worse than watching everyone you love laugh at how awful you are. ) It's not just something he did with me. His college friends, who were foolish enough to take him out and get him drunk, discovered he's a really mean drunk. After several fights and tears, he generally won't do it anymore, unless he gets really caught up in how brilliant he is and then his story/brilliance overtakes common courtesy.
This. Among other traits this is one dh has in spades. "I'm so funny at your expense." I so, so, SO do not want my son to adopt these traits. It may mean I overreact when he displays normal developmental 'experimenting with humor and poor social skills' behaviors. Sigh.