Dang, respectfully, you should ask him what he means by it because I honestly read it differently.

I think he is calling the well wishing weird/phony as most people here are irreligious / not muslims / haven't had a clue about Eid Mubarak until yesterday.

Anyway, I can't be sure either but my point is it absolutely would not have occurred to me until you said it. Caveat: English is not my first language but obviously is a bit far fetched.