Not true at all, that assessment is due to your bias and lack of understanding of the Chinese netizens' mentality. You look from the framework of religion and ethnicity. I don't want to make this criticism but people from religious nations and the west look at everything from a religious perspective, it doesn't reflect the reality in China.
Gulnazar looks closer to traditional Han beauty standards despite being Uyghur and Diliruba also a Uyghur is one of the most popular and loved actresses in China. The reason has nothing to do with her religion or ethnicity but the netizens' focus on her past relationships, acting skills, and her cold face. Some people don't like cold faces and they voice their opinions, just like how people in the West were critical of Kristen Stewart for her bad acting skills and stone cold appearance. Diliruba on the other hand smiles all the time and has a really sweet smile, her acting and personal is also well recieved, people like her for that.
I don't condone online bullying but this is a reality all celebrities deal with and there is not much that can be done about it.