I understand that and agree, but yes, I ascribe a high (societal) value to telling people when they're being rude, because I think to do otherwise is to enable

I understand that and agree, but yes, I ascribe a high (societal) value to telling people when they're being rude, because I think to do otherwise is to enable them. Besides, people like the customer in question come once in a decade (to me, anyway), so it hasn't been a problem.