They were booing in general to Brian's score, not because he didn't beat Yuzuru. Hey, Yuzuru just got the loudest cheer from the same French crowd out of the three. I was kinda surprised that Brian's score wasn't higher. His performance was clean, and I thought he was going to get home advantage.
Doesn't really change my point. Too many people without knowledge in PCS operates on a "Clean + Appealing" = High Score, otherwise low score type of judging when it is not that way.