You're upset about the non-English speaking patrons endangering your employment by not signing up for your bonus programs?
Exactly how do your employers feel about taking pictures of patrons sans permission, not to mention posting them on the nterwebs?
Don't apologise for accurate observation, calling out questionable behavior, or stating plainly when something offends you. If you can't be honest on an anonymous message board, then where can you be?
Learn how to cook. Not just subsistence cooking, learn how to cook well. Like learn how to make bread. The success of a loaf of bread can be measured pretty objectively