It means they are providing their take on what they find disagreeable in the course of their lives here in China.

I find many things "disagreeable" here in China, but I don't bitch and moan about them. I'm sensible enough to realise that they are things I have to live with, if I'm staying here. Thing is, a lot of you expect things to be laid out on a platter for you, and if it isn't, something is wrong!....or "unfair", as silverbaby is so fond of declaring! Life's unfair! Get over it!

Well, well, well, BB! Aren't you bitching and moaning about laowai bitching and moaning about what they find disagreeable in China? Seems that you're at least as big a bitcher and moaner as those of your fellow laowai that you're eager to criticise for doing the very same thing, the only difference being you're unwilling to bitch and moan about things that actually matter in China, such as no laws against racial discrimination because your view is that either it won't make a difference, or your fellow board readers, some of whom may be black people contemplating applying for teaching posts in China, needn't know about it.