I respectfully disagree that the linked pose is out of character. People are rarely one-dimensional, which can lead to surprising decisions, even from people we thought to know better. I don't think that behaving a little silly at times and being sincere are mutually exclusive. In D:OS II, I've seen more realistic characters than in earlier games. They tend to have opinion on multiple things, and they often seem to make decisions based on multiple factors.
I think that everyone has done things they aren't proud of, or because they were just caught up in the moment. The reason for this irritation is that these decisions run contrary to our self-image. At the same time, this is also the reason why we are not one-dimensional. It is my sincere opinion that we should be more tolerable not only for others, but for ourselves as well.
