disability /dɪsəˈbɪlɪti/ noun 1. a physical or mental condition that limits a person's movements, senses, or activities. "children with severe physical disabilities"

2. a disadvantage or handicap, especially one imposed or recognized by the law. "the plaintiff was under a disability"

Women can not produce sperm. Women cannot father children. Women as a whole have physical challenges that prevent them from competing in many sports at the same level compared to men. And women suffer from legal restrictions on their activities in many countries.

You are perfectly fair to point out that the opposite is also true to some degree, men cannot give birth, therefore it can be considered a disability to be a man as well. Depending on your point of view.

The clear problem is in our modern society people don't really have well formed opinions on such things. You can easily annoy a casual feminist by asking simple questions like "Why should women have rights" and they'll become frustrated and angry at you because they cannot answer the question. They're not used to having to defend their core beliefs, and this is a dangerous position to be in since if you're unable to vocalize a good reason as to why women should be given equal legal access and protections in society, then they risk losing those gains. What was given can be taken away if it is not defended.