Mediocre players love pace because all they then have to do is block it back, not needing to produce any pace of their own. In this thread, the so called "pushed" shot, forces the mediocre one to create their own pace, which they are ill equipped to do lacking fundamental stroke technique. The slow paced ball hit with top-spin goes high over the net and deep into the court, changing trajectory, making it difficult for the hacker because it's not in his wheel house. They hack and slash hitting the ball into the net or into the fences. Then they lose and instead of taking responsibility for their lack of game, deride their opponent for not giving them the hard paced balls they shank back unpredictably. Don't feed the hacker.
"...the human emotional system was not designed to endure the mental rigors of a tennis match." Dr. Allen Fox