I know it's from the Daily Mail, but I can't find anyone else reporting on it. I've never seen a woman tell a man to "take it outside" or aggressively kick a display down because they've accidentally been called "sir"... (hope the link works).
www.dailymail.co.uk/news/article-6536045/Furious-transgender-woman-rages-store-clerk-calls-sir-instead-maam.html