For the record, I think John's cool too.
Though gloating, as I understand it, isn't called for. Gloating is what you'd do if you accurately predicted the popular vote, or each and every electoral vote, or maybe predicted the vice-presidential picks of both parties right long before either candidate was officially nominated.
I also don't think it makes Miami look like he doesn't like John. After all, if you don't like somebody you wouldn't pick on him, would you? The emotive outburst was worthy of ridicule, and I think John's smart enough and mature enough to take it.
"Other than that, Mrs. Lincoln, how was the play?"