Nobody, even I like to have some known player at my table, if i lose against him, I can say, hey this guy relegated me.
If I knock him out, that gives a bit satisfaction for few seconds... i like to meet with Mr. Boski on wpn on low tourneys, he played his last hand on few tourneys against me...
Online, there is no downside having a known player at the table, at all!
Live, I saw some disgusting players, whose were provoking the opponents by all possible ways, that's even better, send home some pr*ck like those....