I think Ron Paul was stunned by Brit's response (yes, the other candidates were warmongering for a quick cheer, despite what it looks like to people around the world, how narrow minded of them, very unpresidential), I mean they were talking about the Gates of Hell and sending muslims to meet their virgins. Of course his response was right, the listeners were too obtuse to understand/read inbetween the lines and started snickering.
It didn't hurt him, it just goes back to the main point, that RP's supporters on the whole are more intelligent than the typical Republican (no offense intended.) More Republicans are looking for short catch phrases "Gold bless the USA." "America is the most powerful nation." "Terrorist hate use because we are free." etc...
It didn't hurt RP, but it shows that the RP party is strongly divided, between those that are vested in Neo/Con IMperialism and Small GOvernment/Freedom.