Nice, doubling down on segregation. I commend you on your commitment to ignorance.
Are you sure you’re not a liberal? You would have the person cursing set up as the teacher of the classroom, because that is what they are doing, teaching the rest of the class that it is ok to disrespect the teacher/classroom. Segregation is your term (that liberals like to use), the rest of us understand it for what it is, cutting the rotten from potato instead of leaving it to fester/rot the rest of the fruit/classroom. Barney Fife called it “nip it in the bud”.
If parents are teaching their child at home that they rule the roost, then that child will bring that to the classroom if they can. The disease will spread like cancer, one can not have that behavior in a classroom (and still have it called a “classroom”). A teacher that cares for the future of such children will not ignore bad behavior, probable because the child has never seen someone that cared for it in it’s life, someone that actually cares for their future (and the rest of the classroom they teach).
A mother that loves their child will correct it from playing in the street, a mother that doesn’t will not.... One cares, the other doesn’t. Same goes for a teacher. One takes more effort, the other doesn’t. Can you distinguish?