Good. Being teenagers, as likely as not they didn't fully understand what they were doing. But if that's the case, better to learn now than grow up a racist.
I think that quite often hate crimes are committed by those in the early stages of falling into a hate movement. If they can be caught early, salvation is possible. And may their punishment also serve as a warning to their friends.
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This is what prevent strategy in the UK is meant to address, if words are of concern, redirect Young person to more positive role models / activities.
Take action before words become something such as an attack on local people due to radicalisation.
https://www.elearning.prevent.homeoffice.gov.uk/edu/screen1.html
