If McGinn was a fanny like Zander diamond, I'd have a problem with it, but there are vast differences between the two. He's a lifelong tim and whilst I'd like to think I wouldn't do the same, its his own free time he can do what he pleases (within reason).
Yes I'd like him to celebrate against the vermin but as long as he's performing and scoring that's all I care about. We don't need our own fans to derail our season with in fighting. If anyone boos him, I hope they get a swift punch in the face. I have no doubts he has learned from this.