You can report his PSN profile although that's useless. No, you can't report someone if they already have left a session.
[spoiler]Just a tip, if you go into your party settings screen and adjust audio mix, move the slider all the way to the far right, it'll block out most game sound so you can clearly hear people in the party.[/spoiler]
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I DID and it was STILL that loud. It was ridiculous. Also we had people across the contine t so chat quality was a little iffy. Thank you very much though. Ill just have to hope I don't see the jerk again.