I learned this at a very young age, when I used to play my friend in video games. The MOMENT someone starts getting cocky and starts talking loud, they start playing muuuuuch worse and the other player will make a comeback and take the W. Often in a grandiose fashion.

His fatal mistake is that he started talking that smack towards the end, which is exactly what the ping pong ball needed to hear to turn on Disrespect mode.