How many genders are there ?

I respect all genders, though I find it a little strange, Sam Smith claims to be non gender or something.

Here's my take... there is male... there is female.

If male has a sex change... he becomes female - at least that's how they want to be seen hence they adopt a female name.

If female has sex change... she becomes male - they adopt a male name.

In England train stations have stopped saying "good morning ladies and gentleman" to "good morning EVERYONE" to include all genders - which to me is just crazy.