Why do Western expats seem to hate Thai Chinese people?

I read the comments on this Bangkok Post article, and it seems like a lot of expats dislike that the Thai Chinese people are so dominant in the country, and through their policies are bringing it closer to China? But, it's not even their country, how is it their place to hate an existing minority group that's been established for centuries in Thailand, and to question the country's foreign policy choice?

https://www.bangkokpost.com/thailand/general/2956453/pm-tells-tourists-of-her-chinese-blood