rub it in

verb2

1. •
   (informal) To add insult to injury; to emphasize one's strengths or another's weaknesses in a manner that degrades another.

   • Not to rub it in, but I'm working from home. So I took a swim this morning and have been thoroughly enjoying the beautiful weather.
2. •
   (informal) To labour the point.

   • "Of course it wasn't worth while rubbing it in before young Hollyer, but, as a matter of fact, every single man carries the life of any other man—only one, mind you—in his hands, do what you will." — 1914