First of all, we need to know that several other guests and even two hosts in this program are in urgent need of fitness and exercise, so at the beginning of the program, we also signed several treaties that are difficult to adhere to, and then there are subsequent pictures of Ling, Naomi and hosts Du Haitao and Qian Feng being punished. Only crystal as a "benchmark", strict with themselves, regular exercise, healthy eating. No comparison, no harm. Benchmarking only attracted the envy of several other guests, which is why Crystal was ridiculed as a "nuisance".
In addition, I have to say that every guest in the program will invite friends to be guests and go out to play together. As a "benchmark", Crystal even invited friends to exercise and keep fit. She even goes to exercise with the team members, so she will also make some lazy friends laugh and call her a "pain in the ass".
So we know that it is not unreasonable for Crystal to become an annoying "nuisance" in the program. Of course, this doesn't mean that everyone really hates her, but all her friends and the guest hosts on the show admire her strict demands on herself, so this is actually a nickname for her friends.