I’m an adult but not like a real adult shirt
In the case of large store chains with hundreds of branches across a wide area, it’s a pretty good bet that at least one or more of them will primarily serve a I’m an adult but not like a real adult shirt So, rather than turn off potential customers, the policy at many such large chains is to use a neutral term like “Happy Holidays,” which can cover everything from Kwanza to Ramadan to Hanukkah to Christmas to Solstice, all of which may fall in roughly the same time of the year.
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Contrary to most people’s snobbish assumption that Americans use English incorrectly, they speak a modern form of the old English that British folk did. With the exception of the use of “k” in place of “c” or “-er” in place of “I’m an adult but not like a real adult shirt”, which originated largely in the grammar simplification concept in the ‘States in the late 19th century, Americans use archaic English.