Why would a boy teenager in a car just randomly insult me?

On the moments it made me laugh since it was so random and out of nowhere, dude was in a dirty car completely trashed (they were also kids cause it's a car made for people without their driving licence), they couldn't have been older than 15 / 17.

They were literal kids and one yelled at me "Go to school dirty whore"

Like what's the point of doing those kinds of stuff? What were they trying to achieve by yelling at random people random insult. This don't make any sense.

The stupidest stuff is that I actually know his brother, dude used to spent all days sitting on my porch for no reasons during nearly 2 years smoking weed.

I live in a village and there's some complete morons that's crazy. I was not even dressed bad, I had a long skirt to my knee and a normal long sleeves shirt (not even tight)...

Why would a boy teenager in a car just randomly insult me?
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