What they are telling us: Snowden broke the secrecy rules to leak information. Therefore he is a bad person. Therefore the information he leaked can’t possibly be true. Therefore you should ignore it. Nothing to see here. Move along.
Another way to put it: Other countries already knew we looked at all their phone calls and Internet activity. The only people who were clued in by Snowden were the American people, that their own communications were being looked at. Therefore if they say Snowden is a traitor for giving U.S. Government information to its enemies, that means they think we are the enemies of our own government. I already knew they think like that, but it’s nice of them to admit it.