Perhaps unsurprisingly, CNN’s Don Lemon proved just how ignorant many mainstream media anchors are when it comes to the actual difference between an automatic and semiautomatic weapon.

Reporting from Ferguson, Missouri, Lemon got into an exchange with conservative radio host Ben Ferguson. After listening to Lemon babble on and on about how he was able to buy an “automatic weapon” in just “20 minutes” in the aftermath of the 2012 movie theater shooting in Aurora, Colorado, Ferguson decided to test Lemon’s knowledge.

Watch the exchange below:

“I have maybe shot a gun three, four times in my life — I don’t even live in Colorado. I think most people can go out and buy an automatic weapon,” Lemon added. “I don’t understand your argument there. It took me 20 minutes.”

That is when Ferguson stepped in and asked Lemon how he defines “automatic weapon.”

“For me, an automatic weapon is anything that you can shoot off a number of rounds very quickly. I was able to buy an AR-15 in 20 minutes,” Lemon said.

“With all due respect, you don’t know what you’re talking about,” Ferguson countered. “An automatic weapon is when you pull the trigger one time and it continually shoots off one after another, after another.”

Lemon was not impressed – saying Ferguson was “getting into semantics.”

“This is a guy who is on television speaking as a gun expert essentially, a guy who went and covered this,” Stu said on radio this morning. “And he went and bought these guns. You don’t know, at this point, the difference? Did you buy it legally because the gun you’re speaking of doesn’t do that?”