I have no idea if these articles are accurate or if they're exaggerating the information. In my opinion the red cups fit into Christmas just fine. I also think that doing a generic winter cup with snowflakes or snowmen would have worked as well. Snowflakes and snowmen aren't going to offend any normal person.
Society is really being offended by everything lately. It's just getting annoying. I appreciate not wanting to discriminate but no one is trying to personally attack you or your beliefs with a red, disposable coffee cup.