People tend to have preconceived notions. Having watched "Eating Well for All Three Meals" on TV, they naturally thought that it was the "genuine" program, while "Two Under One Roof" was just a "knockoff."
They started criticizing without even bothering to find out which one of the two variety shows was aired first and which idea came about first.
In particular, Zhuo Yi's fans had been pestering Shi Sui.
When Shi Sui first debuted, he had collaborated with Zhuo Yi in a certain film. During its course, it was exposed that a mere newcomer in the industry had spoken rudely to his senior and seemed to be acting like a big shot by putting on airs.
Later, Zhuo Yi won a double-gold 'Best Actor' award, and he kept using that to mock Shi Yingdi/Shi Sui.