Bar the last bit about Chinese people having small dicks which was inappropriate, it's not self-mocking at all as far as I can see. That last bit is racist, but this is The Tab, complete ****ing trash and always will be.
A lot of these stereotype's the author is trying to turn into positives, I don't think she was saying "Yh lol we eat rice dae ching chong rice lol", she's identifying and addressing the stereotypes in a positive way.
Anyway lol at taking the Tab in any way srs.