Is it true that Feng Shui masters are bad at showing others graveyards?

Haha, this depends on the level of the Feng Shui master. For example, in "The King of Luck in the Daily Class" and "The Secret of Water Revealing Heaven" written by Qian Shengzhu, there are mentions of the "killing master day" that Feng Shui masters are afraid of, and other concerns that Feng Shui masters have in doing Feng Shui that is not good for them. Methods of resolving are mentioned in "The King of Luck". So as long as this Feng Shui master is a real master, he won't be afraid of this small problem.