For me, noone.
I do not"hate" any, but the close it gets would be american guy Mark Dickson. Any of you recall him? He didn't achieve significant results in any of the Slams but i recall his great run to the 1983 US open quarter final, losing eventually to Bill Scanlon.
Dickson had a good attacking game but what really annoyed me back then was his stalling inbetween points during his service games. That's not how tennis should be played i remember.
Commentators back in the day would comment on it when covering his matches. Now most of you will think of immediately Ivan Lendl ( during the 1980's) Rafa Nadal or Novak Djokovic (in 2007-2012) . But Dickson was the worst.