“No wonder he’s single”
You’ve heard people utter this phrase about a hapless dater — or would-be dater. Perhaps you’ve said it yourself after a vexing encounter with a single. And of course, it can be said about either gender.
The speaker usually says it after an unpleasant interaction, or even hearing about someone’s clueless behavior. I thought it myself recently after a potential suitor’s second call, during which this accomplished, intelligent man was argumentative and condescending.