That's stretched. too far. I doubt that in worst cases it's that bad and if it's true it's super rare. I have mild Protan colorblindness, a type of red-green color blindness. I've encountered problems only to distinguish SOME green shades.
It's less possible to encounter a colorblindness problems in pixel art because they use limited palettes - meaning difference between colors won't be subtle.
Yeah because your "mild" experience is the same as everyone else.
Either take the advice and make the ninja blue or something or just ignore it, being as asshole and saying I'm "wrong" because it looks fine to YOU just makes you come off as an inconsiderate asshole. I mean if you like making games you want people to play them which they can't do if they can't see them.
And for the record, it's not "super rare".