A better example would be: On May 31, the stores decide to have a "Spring Holiday" sale, not mentioning that the relevant holiday, the reason for the long weekend, is Memorial Day, because, after all, some people are against the military, some people have relatives who have been killed by the US military and every ethnicity has a spring festival of some kind. We don't even get any time off for Easter any more.

It's Newspeak to say "Happy Holiday" without mentioning the reason for the holiday. You can say "Happy Holiday" on any holiday year-round and "Season's Greetings" in any season. The minor festival Chanukah and the non-existent Kwanzaa would not have given anyone a reason to take time off and celebrate if it hadn't been for Christmas. Ramadan of course rotates around the year. Anyone ever say, "Happy rotating Lunar Holiday" to a Muslim? Even (especially) in Muslim lands? It reminds me of the use of "BCE" instead of "B.C.". Can't mention Christ! Have to say "Before the Common Era". Which leaves unanswered the questions, "Why exactly is this computation used? Why is this Era Common?" No wonder kids are confused.