Presidential hopeful Pete Buttigieg Pete ButtigiegThe Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice Hillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield MORE (D) responded to President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE nicknaming him "Alfred E. Neuman," saying the insult was generational.

"I’ll be honest. I had to Google that," Buttigieg, the mayor of South Bend, Ind., told reporters in San Francisco on Friday. "I guess it’s just a generational thing. I didn’t get the reference. It's kind of funny, I guess, but he’s also the president of the United States, and I’m surprised he’s not spending more time trying to salvage this China deal."

Ouch! Mayor @Pete Buttigieg responds to ⁦@realDonaldTrump⁩ slam that he is “Alfred E Neuman” —“I had to Google that..I guess it’s a generational thing.” pic.twitter.com/ZL11noISYL — Carla Marinucci (@cmarinucci) May 11, 2019

Trade talks between Washington and Beijing ended without an agreement Friday, raising the specter of a prolonged trade war between the two economic titans.

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Trump first introduced the nickname Friday in an exclusive interview with Politico, referencing the gap-toothed, red-haired and big-eared boy who has appeared on the cover of Mad magazine for decades.

"Alfred E. Neuman cannot become president of the United States," the president said of Buttigieg.

The only openly gay candidate in the Democratic primary field, Buttigieg has recently enjoyed a spike in support, shooting up near the top of several national and statewide polls and raking in $7 million in the first quarter of 2019, outpacing several other candidates with higher name recognition.

Friday’s put-down was not the first time Trump has gone after Buttigieg.

"We have a young man, Buttigieg. Boot-edge-edge. They say 'edge-edge,'" Trump said at a Florida rally this week. "He's got a great chance, doesn’t he?"

"He’ll be great representing us against President Xi of China. That’ll be great. I want to be in that room. I want to watch that one," he added.

The mayor responded the next day that he wasn’t "too worried" about the insults.

"You can't get too worried about the name calling and the games he plays," said Buttigieg. "I was thinking of a Chinese proverb that goes, when the wind changes, some people build walls and some people build windmills."

Buttigieg, a former Rhodes scholar and Afghanistan War veteran who’s nearing the end of his second term as mayor, has faced skepticism over whether he’s experienced enough to win the White House. He’s responded that he has more executive experience than Trump and more military experience than Trump and Vice President Pence put together.

Trump appears to be continuing his practice of labeling his political enemies with derogatory nicknames, dubbing Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) "Crazy Bernie" and former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE "SleepyCreepy Joe."

The former New York real estate mogul effectively wielded his rhetorical put-downs to stand out in a crowded Republican primary field in 2016, eventually winning the party’s nomination.