It's a quote from Clue. Have you seen it? If not, and you want to, don't read anymore because this is a spoiler. I can't remember much about the plot, but I think one of the guests told everyone else there he's being blackmailed for selling secrets to the Russians, when really he's getting blackmailed for having an affair. When they learn of the affair, someone says "So communism was just a red herring!" Because--red. Russia. Communism. Very droll.

Since TikTok is Chinese, and China is/was known as Red China because it's communist (and also their giant red flag), I legit thought you were referencing the movie and I was acknowledging your clever joke.

The movie is great, though.