Did you ever see the Nightmare Before Christmas? I’ve seen it used as a simple way to explain appropriation. Basically, there wasn’t anything wrong with Jack being infatuated with the beauty and whimsy of Christmas. However, instead of appreciating Christmas as a beautiful, regional celebration, he treats it like something that’s been kept from him and with his very limited understanding of the intricacies of the tradition, declares that not only will he be hosting Christmas, but it will be even better than the original Christmas! So he takes it to Halloweentown and is praised for his cleverness while giving very minimal credit to Christmastown people, and Santa Claus is denounced and imprisoned for trying to celebrate it.
Things that fall under CA are objects or traditions with important meanings to a minority culture, cheapened and treated as novelties, especially if a profit is involved. Appreciating another culture’s art or dress or anything else isn’t CA, but treating a culture’s traditions as entertainment without regard for the meaning of them within that culture is CA.
None of this applies to majority traditions like modern Christmas or any other national holiday. While cultural, those are what I consider “public domain” holidays. Everyone is assaulted with them from all directions when it’s their time of year. They’re celebrated almost universally with people adding or subtracting whatever they want.