I agree with minny but her profile picture... I CANT TAKE HER SERIOUSLY! But yes, I do see her point. I would like to add that, asexuals should feel more welcomed to use the restroom that suits what gender identity they relate to and feel suited to be in.
Unisex bathrooms nowadays are just locked from the inside. Only one gender is using the bathroom at one time. In that case, the bathroom *is* segregated by sex because only one gender is using it during one time.