I didn't see that as egotistical as much as being hard on himself. While it may sound like a slight to Stephanie, the truth us she (like so many Top Chef winners) seems to have dropped off the radar. Meanwhile, Blais has managed to leverage his time on Top Chef into a higher profile career as a chef and TV star. I would bet twice as many people remember Richard as they do Stephanie, even though she won.
He is a big geek, and his wheels are always turning, and he tends to express a lot that's going on in his head. But I've never seen him as being hostile, arrogant or dismissive.