SAN DIEGO — They brought him the money in a silver metal briefcase and placed it on a picnic table at Miramar Reservoir. Up came the lid: $100,000 in paper-strapped stacks of $50 bills.

All those greenbacks beside all that blue water — no wonder Lenin Gutierrez’s eyes got big.

“I [have] never seen anything like this except in the movies,” he said.

Three weeks ago, the 24-year-old college student was working at a Starbucks in Clairemont when a customer came in without wearing a face mask. He pointed out the coronavirus rules, she left, and then criticized him on Facebook for refusing to serve her.

That caught the eye of Matt Cowan, an Irvine marketing and brand strategist, who thinks masks are a good idea and internet bullying a bad one. So he started a “Tips for Lenin for Standing Up to a San Diego Karen,” using a social media label for overly entitled people who boil over in public.

He was hoping for $1,000.

The campaign reached that within hours, then hit $5,000 and kept growing. Something about it struck a nerve, vibrating along the political and cultural fault lines that have ruptured so much of American life, even during a public health crisis.

Newspapers and TV stations in San Diego and elsewhere spread the word and brought interest from donors as far as Australia.

As the cash poured in, Cowan said he realized his virtual tip jar wasn’t just making a statement. It was changing a life.

Gutierrez grew up in Chula Vista in a family without much money. He said they ate a lot of rice and beans. At Christmas, the boxes under the tree were prettily wrapped, but mostly empty.

So when the GoFundMe drive hit $100,000, Gutierrez said, “It’s more money than anyone in my family has ever had.”

Now, what once seemed like dreams are attainable goals. He plans to move from community college to Cal State Fullerton and study kinesiology, the mechanics of human movement. His passion is hip-hop-infused dancing, and he wants to apply what he learns as an athletic trainer.

This wasn’t the first time a customer came into Starbucks without a mask, Gutierrez said. It wasn’t the last time, either.

“I would say about 80% of the people are cooperative and wear masks,” he said. “Another 10% just forgot and are apologetic about not having one. And then there are maybe 10% who just don’t want to wear one.”

His experience dovetails with public polling on the issue. A Pew Research report from late June found that 80% of Americans have worn masks at least some of the time while in stores, and 65% have worn them all or most of the time. Seven percent said they never wear a mask.

Cowan and a colleague, Will Collette, brought the cash to Gutierrez last week and posted a video on YouTube in part to show that the campaign was legitimate.

“Great day to change somebody’s life,” Cowan said in the video, just before he parked his car at Miramar Reservoir and walked toward Gutierrez with the metal briefcase.

“I don’t know what to say,” Gutierrez said when he opened the case and saw the stacks of bills. “This is so mind-blowing right now.”

He lives in Clairemont with one of his sisters, who was with him at the picnic table. His other sister was there too. So was his lawyer.

“A lot of doors are opening up for me because of this,” Gutierrez said. “I want to make sure I’m doing the right thing, setting myself up for my life down the road.”

Wilkens writes for the San Diego Union-Tribune.