Without context, I'm really loathe to make much of a judgment here. I suspect that the passenger filming this goaded the TSO into that remark and that behavior. TSOs are supposed to be better than that, of course. But if the passenger filming this was acting like an idiot for ten minutes before this event, this response may actually be quite admirable.
In short ... this video is so short that it's a Rorschach inkblot. People will see in it what they wish to see.