I think your confusing gender roles with actual gender.

I'm using the terms as most science does, i.e. what is anatomical characteristics is called sex (which you apparently mean by gender) and psychological and social ones are called gender.

the argument on why and how there are more genders then 2 is that gender is a social construct so it is not real. if social constructs are real then we only have 2 genders.

You're confusing real and material. Or so I think, your English is beyond comprehension here.

besides calling gender a social construct do you have any way to support the claim that there is more then 2 genders?

There's quite a load of anthropological literature about cultures where there are more than two genders.