Sure its harmless, but since it is not tied to the culture or sincerely held beliefs of any particular minority group, it is fair game for insults. It is nice to have a custom that can be ridiculed and no one has a right to be offended, let alone not be offended.
I’d say that all customs are fair game for ridicule. Sure, people like to pretend they’re offended — and they may even feel offended — when someone “insults” Christmas, Easter, Yom Kippur, Thanksgiving, or Ramadan, but they don’t really have any such “right”.
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