I don't understand his post the same way. He said that the only sexism prevalent in this industry is the "girls code"-type sexism. Sure, sexism exists everywhere and always, as does racism and other -isms. Simply said, people will be jerks. However, it is unreasonable to draw conclusions for the whole industry based on the behaviour of one such jerk, that just happens to be a male sexist (I'm sure you'd find female sexists and black racists as well).