I'm not a fan of tennis, but I get annoyed that women demand the same pay for essentially less work. In other sports, such as my own favoured sport of rowing, women had to argue hard to get the right to compete over the same Olympic distance as men ;in athletics, women had to campaign to get the right to compete over the marathon course (move away from the idiots who felt that women weren't physiologically suited to run that far).
It's a shame that when women in other sports have campaigned so hard to be competing over equal distances that female tennis players adopt this stance.