You'll see it in movies, you might see it nowadays more as a joke; when someone is calling somebody a commie it could be because they're trying to insult that person or paint that person as someone who is somehow extreme.

你会在看到， 现在可能更多地作为一种玩笑；当有人称某人为“commie” 时，可能是因为他们试图侮辱人， 或人描绘成某种极端的人。

The question is about the expression " to be a commie" (commie).

问题是关于表达“to be a commie”（commie）。