If I have to hear "Why did you dye your hair again?" in a condescending way again, I will explode.
Why is it necessary to comment in a negative way on someone's appearance?
I know that it will damage my hair. I obviously know that. I know that it is a completely different color, I am the one who did it, I see myself in the mirror. I don't care if you think I looked better in whatever color, I don't have that color anymore.
Stop putting people down because of things you don't like (or wouldn't do).