Arya and Lyanna's bravery and skill show that women are better fighters than men
The male chauvinist pigs are probably complaining about SJWs. They're complaining about how this was a bad episode.
Lyanna showed the Hound how to fight. The Hound is a male chauvinist coward.
And Arya killed all of the army of the night walkers singlehandedly.
You go, girl!