I loved BBS too. It was one of my favorite Kingdom Hearts series.
Well, of course it's kind of disappointing when other people have different opinion, especially when it comes to offensive opinion.
Just let it go, I mean, everyone has their own rights to judge the game they're playing, whether it is positive or negative.
Even if it's so offensive, you can just ignore them. For me, it's no use to argue.
I understand if someone would hate BBS. Some may judge it as ' too childish', 'Tired of TERRAism of Ventus', 'Don't like the Gameplay' or even 'Darkness blah blah blah'. Well it's up to their reasons. I also have my own reason to like it despite its flaw. So, don't even care, man. It's just an opinion of some other player.