I've actually seen lower ranked players who are incredibly happy to beat stronger opponents,
even knowing it was handicapped. Because generally speaking, if a 2 beats a 7 or whatever,
it's because they played better that day while the 7 shot below his normal speed.
It's actually fun and competitive for the lower ranked player who is dying to win
and say "I played above my head and beat that guy."
But, to be fair, I never saw a higher ranked players act deliriously happy that they beat a 2.
I remember being a 6 (as high as it goes in my league) and playing a 2. I scratched the 8 on the break, 1 loss, and was running the table on the next rack when I accidentally knocked in the eight out of turn. The 2 screamed "Yeah, I kicked his ass!" (and he was being serious!) He went around telling everyone how he beat me! Funny thing is he never made one ball in the entire match.
I have never considered losing like that being beaten. Until I can beat you on even ground I don't consider myself a better player.
It didn't really bother me so much what he did, it just surprised me, the mentality of some of the league players. But I guess there is nothing wrong with him having his moment in the sun.