ET caught up with the 51-year-old actor at Comic-Con 2015 in San Diego, California, on Thursday, when he further explained his tweets slamming Grande's apology for saying she "hates Americans," while at a donut shop in Lake Elsinore, California, last Saturday.
"When my American fans make me money I always like to say that I like them -- but that's just me," Rob told ET's Kevin Frazier.
"It's all good in the hood," he laughs. "She's in Scream Queens which is after my show, The Grinder, so I'm psyched to see -- maybe now they'll kill her earlier."
Ariana, 22, apologized on Wednesday for the video of her at Wolfee Donuts, in which she also apparently licks donuts she didn't buy. "What the f**k is that?" she then says to an employee who brings out a fresh tray of donuts. "I hate Americans. I hate America. That's disgusting."
The "One Last Time" singer now says she was expressing her frustration at the Unites States' high child obesity rates.
"I am EXTREMELY proud to be an American and I've always made it clear that I love my country," Ariana said in a statement. "As an advocate for healthy eating, food is very important to me and I sometimes get upset by how freely we as Americans eat and consume things without giving any thought to the consequences that it has on our health and society as a whole."
Rob called the apology "lame" on Twitter. "As my grandpa would say: 'Yeah, sure. Pull the other leg, it plays jingle bells!" #Lame,'" he tweeted.
"Cannot wait for the new Ariana Grande/Dixie Chicks jam to drop! #IActuallyLoveAmerica," he added, referring to the Dixie Chicks famously criticizing President George W. Bush during a concert in London over 12 years ago.