@LeoRavus
The kid looks like he was 5.
How many 5 year olds do you hear talking like that? I d
on't recall it even on the playground in elementary school, and if someone let it slip they got taddled on. He said that stuff in a communicative way like he hears it all the time. He didn't cuss just to cuss...he's been well versed in it for a long time.
More common than you seem to think.
Like I said, a child can learn bad behavior in more places than just home. I know you have a very romanticized idea that children mostly learn behavior from home, but that simply is not true for all children.