The comment being responded to is BS. 'Even modorate muslims actually believe that womean sink.' That's pure BS. You might encounter it in end cases, isolated, uneducated, poor or ultra-religious sectors but on the whole it's BS.
It is just like Europeans (& others) citing Americans that think the world is flat or don't notice when you swap Russia & N. Korea on a map. "Even American geologists think the world is 5000 years old."
All these upmods haven't been delivered because the level of insight or quality of argument. It's because attacks of this kind are easy wins in 2009. It was a (probably made-up) anecdote: Even moderate muslims thinking that woman can't swim.
Just like I've said multiple times already, culture isn't sacred. Just because it's cultural doesn't mean something should be tolerated. But giving infinite rope to any 'muslim women are oppressed' line is garbage. All up, dress codes are down the list of worries.