My stance in any disagreement is that it's not fair to just hear one side and then decide what you feel about either party. Give him a chance to explain.
I'm a moderator on a trade forum and a personal friends with one of the big posters on there who's quite influential in the industry, he often manages to rub people up the wrong way, a great guy but a bit Marmite, particularly his online persona. I was out with him a couple of weeks back and my phone lets me know if somebody has raised a complaint against another member, in the moderators forum there's a whole thread about my mate and his online battle with another guy, when I got my phone out to see the message it was his arch enemy complaining about him something tat happens regularly and he's well aware of, I mention that is the the nature of yet another complaint and the thread in the mods forum had lots of new posts. My mate says, "let me see" and comes to the side of me to look, sees his name and takes my phone, I'm trying politely to get it back but he's now insistent and staring sternly into my phone. It was very embarrassing for me, fortunately all the mods were on his side and it only confirmed what he already knew, the other bloke was a complete dick.
If there had been something uncomplimentary and he'd kicked off and spread it around that I'd "let him see" the comments it would have been bad, I'd probably have been relieved of my (albeit unpaid) duties, I suppose I would have been in a similar position to Mr Fishy's mate.
I'm not saying this is the case here, but as above, as soon as you're sure he's seen this thread and not replied you can name him, until that point he should be given a chance.