Well, it's a little late, but...
One thing I would have done, had I been the bard, is refuse to help the wizard. "Oh, he's at -6 and the cleric's out of healing? That's a shame... What? Yeah, I could heal him, but why should I?" Along similar lines, if the bard doesn't consider the wizard an ally, he shouldn't benefit from bardic music effects.
If the problem player continues to be a problem I'd give him the boot. Especially if he keeps being a problem specifically to the bard's player. It sounds like he's a jerk with a fat case of "I'm older so I'm better" and that crap doesn't lend itself to fun at all.
On the other hand- we have only heard one side of the story, so it's quite possible that the situation was more complicated than Bob5th acknowledges. It's easy to get caught in your own perspective when there are perfectly valid other perspectives on a situation. Still, it sounds like the wizard's player is a metagamer who'd rather cause problems for the group to benefit his character than help the group if it inconveniences his pc. A little backwards, if the party is either lawful or good.