A Bill Buckley Flashback

Back in the day, the National Review features "The Week" and "Notes & Asides" were sort of the pre-internet social media of the conservative movement with a Twitterish feel of short and pithy blurbiness.
I can recall an exchange, from the mid-1980s, between Bill Buckley and a reader who had written in that went (from memory) like this:

Correspondent: "Liberals are always accusing me of being a fascist. How should I respond?"
WFB: "Just say 'All the communists say that about me.' Of course, that sort of comment is tu quoque but fascists are known for that.