I know in college and NF ball, 2 unsportsmanlike conduct flags is an ejection. The NFL doesn't have that? Do they even have a limit? If not, then what the h*ll good is an unsportsmanlike conduct flag to start with?

If their limit was two, he would have been ejected. In football, an ejected player doesn't have to leave the confines of the field until an intermission or the end of the game. They're just not allowed back on the field. (Correct me if I'm wrong on that)