Being polite is a privilege.
Some people have never even heard of 'nonviolent communication', 'I-messaging', 'listen-looping', 'conflict resolution', 'transformative justice', etc.
These people often don't not have loads of progressive friends, stable jobs, caring parents, etc.
Please bear that in mind when someone who has it worse than you says something mean or whatever, because they might just be expressing themselves the best way they can. Work with the emotion, not the words.