At one point during Tuesday night's GOP debate, Rand Paul was speaking about foreign policy when Carly Fiorina kept interrupting him. Donald Trump made a comment about it and got booed for it, as evidenced at the end of the above video and confirmed by the transcript of the debate:

CAVUTO: Senator Paul, you have already said, sir, that that would be a mistake in not talking to Vladimir Putin, or to rule it out. You've argued that it's never a good idea to close down communication. With that in mind, do you think the same applies to administration efforts right now to include the Iranians in talks on Syria?
PAUL: I'd like first to respond to the acquisition, we should -- I think it's particularly naive, particularly foolish to think that we're not going to talk to Russia. The idea of a no fly zone, realize that this is also something that Hillary Clinton agrees with several on our side with, you're asking for a no fly zone in an area in which Russia already flies.
Russia flies in that zone at the invitation of Iraq. I'm not saying it's a good thing, but you better know at least what we're getting into. So, when you think it's going to be a good idea to have a no fly zone over Iraq, realize that means you are saying we are going to shoot down Russian planes. If you're ready for that, be ready to send your sons and daughters to another war in Iraq.
I don't want to see that happen. I think the first war in Iraq was a mistake...
(CHEERING) (APPLAUSE)
PAUL: You can be strong without being involved in every civil war around the war...
MALE: (INAUDIBLE)
CAVUTO: ...Well, then how would you respond?
PAUL: Ronald Reagan was strong, but Ronald Reagan didn't...
FIORINA: ...Ronald Reagan walked away at Reykjavik.
PAUL: ...send troops into the Middle East...
FIORINA: ...he walked away, he quit talks...
PAUL: ...Can I finish...
FIORINA: ...when it was time to quit talking...
PAUL: ...Can I finish my time?
TRUMP: Why does she keep interrupting everybody?
(LAUGHTER)
TRUMP: Terrible.
(BOOING)
PAUL: Yes, I would like to finish my response, basically.
RUBIO: You know, if I may respond...
PAUL: This is an important question. This is an incredibly important question. And the question goes to be, who do we want to be our commander-in-chief? Do you want a commander-in-chief who says something that we never did throughout the entire Cold War, to discontinue having conversations with the Russians?
I am not happy about them flying over there. But I'm not naive enough to say, well, Iraq has them flying over their airspace, we're just going to announce that we're shooting them down?
That is naive to the point of being something you might hear in junior high. But it's scary...
(CROSSTALK)
CAVUTO: But if you're not going to respond in a no-fly zone strategy, what would yours be?
PAUL: The first thing I would do is I wouldn't arm our enemies. I wouldn't arm ISIS.

Reporter Jessica Arp of WISC-TV asked him about being booed and Trump smugly denied what everyone had seen, saying it was all in her head:

Interestingly, The Hell Toupee was going around boasting about his "diplomacy" by calling out Fiorina,and the rest of the media also noted that Trump was booed, he has continued to steer clear of the fact that he was booed.

What bothers me the most isn't that Trump mewled about Fiorina or that he denied what was plain to anyone else. What gets to me is that he was allowed to be so rude to a woman reporter and no one called him out on it. If the other people there had done their jobs, they might have deflated Trump's ego, even a little.