I HATE it when people give me mussar.
Even worse is when they do so in a public forum.
Even worse when the "issur" they are giving mussar on is in fact NOT an issur, and this person is just misinformed.
So with this misinformation in her head, she publically mussar-izes me, when I am doing nothing wrong.
Mind your own business! Leave me be! And if you must say something, say it discreetly and privately! But make sure you're not incorrect on what you assume to be an aveira!