It's entirely possible you're right, but all you know about the situation is what he's written here. Without any other information, I'm inclined to believe what he's saying.
1) Virtually every single time I've heard my guy friends talking about (and drawing conclusions from) a bad date, it's almost always (in my judgment) psychobabble BS - there are a million reasons for having a bad experience. Now that I think about it, this applies to women talking about their dates too.
2) Why would you talk about a bad date on an internet forum? I have a strong prior belief that any personal interpretation of the opposite side in a romantic situation on an internet forum, is probably wrong.
But it's not hard to have an engaging conversation with someone, even someone you are not interested in as a romantic partner. Especially when you have things in common to talk about.
He pointedly stated that he didn't want to do this, citing a problem he had with her attitude. To me, it doesn't matter what tone she used, what non-verbal cues she put out there. You're sitting there with someone doing nothing else but talking for an hour or so. If you can't make the most of it, and you blame the other person for that, then it's you that has the ego problem.
A conversation, particularly in a date context, is a delicate dance of perceptions, temptation, discovery, and yes, ego. It's fun whether or not you plan on doing anything else with them or even whether you like them.