The incident was captured in a 10-minute cellphone video recorded by one of the students and posted to YouTube. It shows 68-year-old Karen Klein trying her best to ignore the stream of profanity, insults and outright threats directed at her. At one point in the video, she breaks down in tears.
Klein told the NBC Today show that she hopes their parents will view the viral video of the attack and talk to their children about being "a little more respectful."
By early Wednesday, the video had gone viral, and by Thursday morning, it had been viewed more than 1.5 million times on YouTube.
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Klein told "Today" that it took "a lot of willpower" not to respond to Monday's jeers from at least four seventh- and eighth-grade boys riding the bus operated by the Greece Central School District, a suburban Rochester district that's the ninth largest in the state.
"I'm not usually that calm. Just ask my kids," Klein said during the interview.
"I'm sure they don't act that way at home, but you never know what they're going to do when they're out of the house," she said.
VIDEO of KAREN KLEIN on NBC's TODAY SHOW
Earlier Klein shared a few of her thoughts with a Rochester area television station