Probably because you were Asian and maybe the combination pale+Asian, it's not expected per the clichés we Germans have about Asians.

Children of four can hardly be called racist or engaging in discrimination, their idea of social norms and appropriate behavior is not very far developed. If the child acted inappropriately, it would have been upon the mother to put a stop to it.

While being overweight is not considered attractive here, it's too common to warrant special staring unless we're talking about "I could go on My 600lb life"-levels of obesity. If those staring were mainly men, the busty part of your self-description together with a halter top would be an ample explanation in any country. I'm as German as you get and also relatively skinny (BMI about 19.5), but you can bet my bustyness attracts plenty of stares.

And yes, we are a direct people in many ways. Even with our eyes.