1. Thailand is a male dominance society. Like most... Woman emancipation still has a long way to go.
2. Visa is an immigration issue. Handled by embassy staff who don't report to immigration. That leaves them the power to decide what they want. The ultimate power is actually with the IO at the airport who can turn you even you have a visa.
3. Many expect that requirements for Non-OA visa will be extended soon to other visas. Non-O in particular.