For he's a jolly good fellow that nobody can divide

The story:

Can't remember the moment. But it makes perfect sense to me. Let's say the guy goes to a bar, and he's under 21. He's going to get denied, no matter how jolly or good he is. But it's doubtful even the meanest bouncer would divide him - is someone going to, like, give him conflicting views on a sensitive issue? I still think it's easier to deny someone than to divide someone.