South Korea has this phenomenon. They have had handicapped parking spaces close to the entrances of shopping malls like Lotte Mart and Shinsaegae for a long time but then about two years ago they put in another row of special parking spots designated for pregnant women. Personally I didn't think twice about it because the subways here have designated seats for the elderly, incapacitated, pregnant, and those with small children. It makes just as much sense to me for pregnant women to have special designation areas as it does for the incapacitated.
Anyways, a little while later, the shopping malls put in a third row of specially designated parking spots, this one was for "women." This didn't really bother me either because:
A. I've seen the demographics of shoppers at these stores. An unusually large number of them are women who bring small children with them to the store who just like the reserved subway seats for people accompanied by small children, there are some considerations that are helpful for adults escorting children through the parking lot. Careless children are often hit by cars in Korea and because Korea still largely conforms to a traditional patriarchical social structure, almost all of the children are cared for by women. And...
B. The parking spaces are owned by the STORE. They can do what they want with them. I understand that they are a commercial entity that is trying to attract customers in any way they can. They don't have to provide ANY parking spaces at all because in Korea there are no laws that say they need to. Plus the parking space gender rules aren't enforced in any way either, just like the subway seats.
If the host of a party asks me to save the lawn chairs for her aunt and uncle I'll gladly stay out of the lawn chairs, It's common courtesy.
If someone gives all the girls strawberry ice cream and all the boys vanilla, but I'm a boy and I really wanted strawberry instead, do I complain about it? No. I'm just happy I got some ice cream. Or I just line up in the girls line and get strawberry instead. It's no big deal.