Needless to say, this has created a bit of a furor from a whole stack of writers... but it's something that's been going on for a while, now - this whole not-paying or not-paying-a-fair-rate to writers, so all I can say is it's about time.
Mind you, this attitide isn't confined to the editor-in-chief - yes, that was the 'some dude' - it's also held by at least one staffer holding a salaried position, who believes that writing for free means that, as a writer, you don't have daily hours, deadlines, or need to work on weekends and that the 'exposure' is worth doing something for nothing.
Both these guys delicately avoid the point that they make money off the content they provide, including any content they seek to be allowed to use from other bloggers. While bloggers might post for free on their blog, it could be said that if someone wants to use that content, it's not for charity, it's because that content is expected to grow their audience, or appeal to their audience and assist in their own publication's profitability. For these benefits, it's fair to offer payment.
So, think about it - Huffington Post makes money from those who click on its - often unpaid - articles. There is a way to express your dislike. As Porter Anderson and Chuck Wendig have suggested: Don't support them. Stop clicking.
And think on this:
Instead of screaming at markets like the Huffington Post (because they are not alone) ... just. don't. write. for. them. - Of course, this means that some other writer is going to write for them, one who doesn't understand that working for nothing means that more people who own markets will think that not paying writers is okay, that it will take a lot of writers not sharing their content and a lot of readers not reading or sharing their content before they understand that words which make you money need to be paid for.
Some links that provide a number of different views on the Huffington Post and paying the writers matters as follows: