How Casual Sexism Put Sqoot in the Hotseat

I have a problem with the phrase "casual sexism". What makes sexism even potentially "casual"? Would I be able to write off a badly worded ad for being "casually racist"?

Hey, I'm one of the co-founders of Sqoot. We're a small startup trying to do big things. Sometimes we trip and fall. This is one of those times. In hindsight, our language was reckless & immature. Please accept our apology:

http://blog.sqoot.com/we-can-do-better-an-apology-from-sqoot

So what's the solution? Removing beer-serving booth babes from the events? Or having an adult double-check your marketing releases?

I guess I'm not sure which of those problems we're objecting to.