But putting forward a stupid notion such as there being more than 2 genders is stupid.

Yes that's called enbyphobia, it is a type of transphobia, hatred or invalidation of a person's identity which is Bigotry. Being a bigot is determined by behavior, not that you don't consider yourself one.

There are only 2 combinations of the xy chromosomes.

Congratulations you just made an idiot of yourself again, as I am an Intersex with XXY and have the karyotype test proving it. I'm also not ashamed of it either.