If you follow me, you may not ___

From time to time on my various Twitter accounts — that I have for focusing on one or another topic and not for trolling, I swear — I see someone, call the person X, issue the warning that “if you follow me, you may not follow Y,” Y being someone who has offended X in whatever manner. I could have used Karen as a generic name in lieu of X, but perhaps that name has been pounded on enough of late. A recent example came from an…