Thats why i say the friendzone doesnt exist. You can be nice and just not be attractive in the eyes of someone else. If you were truely nice, that would be disappointing but OK.
What Nice Guys™ don’t get though is describing yourself as nice is the equivalent of a restaurant describing its menu as ‘won’t make you sick’ or a movie with the tagline ‘The actors are clearly visible’ ie: The bare minimum you should be.