Bisexual is like liking more than 1 race

Rebecca • Married to my high school sweetheart. Currently have 2 children Xavier Cole and Mariah Nicole.
Ok so recently I read where someone said that you can't be bi sexual. They stated that if you are bisexual its only for attention. Well thinking about it, isn't being bisexual sort of like someone who likes 2 different races? So I can like whites and blackes but I can't like boys and girls? Just the way I think about it.