To everyone whose response is, "I'm not a Christian, but...," why dump on other people's good wishes? If a holiday is about free time, good food, meeting friend

To everyone whose response is, "I'm not a Christian, but...," why dump on other people's good wishes? If a holiday is about free time, good food, meeting friends, and general expressions of good will, who cares what the historical origin was? When I lived in the Middle East, I always responded to "Happy Eid" in kind, not "I'm not a Muslim, but..." I accepted the holiday in its intended spirit and I honestly enjoyed Eid over there as much as Christmas in America.