Ah well, such is life, even though I think it's more common for the other person to appreciate tips he/she is getting :) And I'm not saying it has to be critique, but maybe as good tips?
As I tried to help someone by commenting about aperture use only to notice, that he had only taken the photos with a phone camera and all his other photos (with a real camera) were far better than I'm getting.. well, mistakes happen :D