The Vancouver Sun, who obviously has a bit of a pro-Canucks (and inherently anti-Blackhawks) bias, made it sound like Keith told Thompson to get back in the kitchen and let the men talk hockey. Greg Wyshynski of Yahoo Sports has a more measured take. Cathal Kelly of the Toronto Star even goes so far as to say that Keith's comments actually confirm equality in the locker room. So there are takes on all ends of the spectrum.
In reality, the exchange was simply an example of frustration from a player who believed a reporter was asking a pointless question after a frustrating loss.
The play in question was a breakaway goal by Daniel Sedin. Keith was the closest player to Sedin, and slashed him right as he was shooting.
No penalty was called, and even if it was, it wouldn't have mattered, because Sedin scored. It would have been called a delayed penalty, and immediately waved off as soon as the puck went in the net.
Understandably, Keith viewed this as a rather insignificant portion of the play. No penalty was called, and even if it was, it wouldn't have resulted in any penalty minutes.
Here's the play:
Still, for whatever reason, Thompson pressed Keith pretty hard on the issue. Keith noted that there was no penalty called, and Thompson pointed out that perhaps it should have been called.
That's when the comments started to move towards Thompson's gender, and where it seems to some people as though Keith may have been sexist in his remarks. The audio is available here, but I'll give you the transcript:
Keith mentioned Thompson's gender when he said "the first female referee." It wasn't in a disparaging way, it was merely a comment that if Thompson was made a referee, like she seemed to be suggesting, she would be the first female one.
Later, some of Keith's comments WERE disparaging. Like when he said she probably couldn't play hockey, either. But that had nothing to do with her gender, and everything to do with the fact that she had just said she can't skate. That's not a female issue, that's just an issue of someone who can't skate. There are males and females alike who can't ice skate.
Lots of people would love to make this an issue of gender discrimination, but let's not get overly sensitive. Was Duncan Keith being a bit of a jerk, playing the "you've never played the game so you shouldn't report on it" card? Sure. But that's entirely different from being sexist.