Unexpected response
The way Ezio continuously dismissed Belmont was more than a little insulting. Perhaps there was some history there, or maybe Belmont had some kind of negative reputation amongst the Crystal race. Outsiders, such as Silvia, would still worship him but within his own race perhaps he was looked down on by a certain class. That would also explain his need to boast in front of Lex and feel superior.
That was not necessarily a bad thing, for Lex at least. Equipped with this knowledge he could think of more ways to get what he wanted. After all, he was nearing the end of what he knew.