Monosexism is a word used to talk about people who only like one type of gender. It's like when some people only like boys or only like girls. Monosexism means people who only like one gender, and they might be mean or not nice to people who like more than one gender. This is not fair, because everyone should be able to like whoever they want and it's OK to love more than one gender. It's important to remember that everyone's love is special and good, no matter what gender they love.