haha... you have the best interpretation here ayears. "The phrase usually implies or describes a person who tends to put attention to his personal gain and loss (success and failture) excessively." that's so K-Mart... he's all about the personal stats.
That can be interpretted as racisim can't it? Trying to say that to all the Chinese of "mian" descent. Just because they aint "han", calling them bastards is just wrong.
As far as KMarts tattoo is concerned, doesn't it mean that ill gained will be ill lossed. I just wonder where he gotten that tattoo, that's not a very commonly used Chinese saying.
That t-shirt just says balls without reference to the quality, so not sure what kind of statement is that dude is trying to make.