No one should take offense at being wished well.
For me, I'd just feel kind've silly wishing someone Merry Christmas, if that person didn't celebrate. I wouldn't wish someone Happy Diwalli! knowing that they don't celebrate it. They wouldn't, hopefully, be offended, but they might be confused
And that's why I wish people Happy _____!! whenever I know what particular blank they celebrate, but leave it a generic Happy Hollidays (Or, if I'm feeling nostalgic for the good *old* days: Happy Solstice) whenever I have no idea whom I'm well-wishing.
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