Thats such a gross generalization. Does it happen? Yes totally, but the meme propagates a stereotype that the average (if not every) cafe worker is like this.
Thats my main issue with a meme like this, is that it normalizes mocking and belittling a class.
Would you for instance find it okay if we substituted "tips" for "change" and "barista" for "a homeless person"?

Ahhh fond memories of the Wrath of the Lich King pre-launch event. I remember I would stand on the awnings of the area with the PvP NPCs in Orgrimmar, trying to not get infected and watching the carnage below.
They made it intentionally to mimic the initial corrupted blood incident, as they saw how much engagement and coverage they received from it.