I didn't get that at all. I guess because I'm more of a introvert I saw nothing wrong with Chuck not wanting to sit around while people party and get drunk, especially when you have to work the next day.
Him going at all would be a show of affection for Jimmy. And the fact that he stayed for Jimmy's performance would show that even more. Jimmy seemed to only be concerned about getting Chuck to have fun, and he seemed happy when Chuck came out of his shell. That seemed to be Jimmy's whole purpose, so I don't think he would be upset when Chuck took the microphone, but happy.
Then Chuck taking Jimmy home and taking care of him, getting him to bed.... I'm not seeing where we are supposed to see Chuck worse off.
7nine