To me the most plausible explanation of why anyone would write that comment is trolling. I can't quite imagine someone writing it using the same words for different reasons.

As a comparison, here is a (fictional) comment I could even upvote if I saw it in a Group Rationality Diary:

My father and I decided to create a secular version of Christmas. We love to exchange gifts, but we are not religious, so we tried to remove as much of the religious context as possible. We even moved the date to Dec 31st, as a symbol of ending the old year and a hopeful beginning of a new one. We keep the tree, and we decorate it with red, white and blue ribbons, as a symbol of freedom.

It seems similar, and here are the removed parts:

Rationalismas; hypocrisy or talk of the baby Jesus; Very secular

Obviously, they are applause lights. Just not really appealing ones; and too concentrated. Either someone is really clueless, or more likely just mocking; both of these options deserve a downvote.

The American patriotism thing is not a problem per se; it is just another evidence for trolling. If it was the only suspicious thing in the comment, I would just skip it as a cultural difference.