In other words they have standards and they're walking away because women who meet them don't exist in today's culture,

This is just the male equivalent of this:

She's free to have those standards of course, but as I've said elsewhere on this thread women tend to be unwilling to accept the likely outcome of maintaining those standards.

In truth, most MGTOW guys are low status men salty about being priced out of the sexual market place and use the "women are shitty" excuse to justify their resentment. Instead they should improve themselves and the female problem mostly solves itself.