The only way that it could be racist is if they say " A piano is racist because there are more white keys than black keys".
I believe that an inanimate object cannot be racist. Change my mind.
Pianos are racist because it clearly separates white keys from black keys, putting the black keys farther away from the player. The black keys sound weirder than the white keys and need specific symbols on a sheet to tell you that it's a black key.