Well this is kind of subjective, isn't it? You may have an argument for why it's not, but I can't think what it would be.
I celebrate Christmas because I believe Christ was the Son of God become man (and yes, I know He almost surely wasn't born then, but that hardly matters). You don't, so there is less to counteract your disgust at the noisesome commercial disaster it has become, so I am hardly surprised you don't like it. (Also associated to Christmas, of course, for me as for many, are a large number of closely connected, dear memories).
I like Thanksgiving for similar reasons (subject and season). New Year's is not bad, though not great, and July 4 depends on my mood.