Look, your definition of an "appallingly rude tirade" changes if you have a child that isn't neurotypical. I see a kid who is having a hard time and needs me to help him regulate himself after a day of school making him feel like he's not good enough.
You have said earlier on the thread that you have told your children they can be angry but only in their rooms.
That's great for you that your parenting can be so hands off.
But not all kids are that docile. Some kids, mine included, would find that extremely hard to tolerate. You may not understand that, but I do.
It's about learning what they need and addressing it, coaching them to handle their big emotions and encouraging them when they get it right.
Much of that falls to parents, and I don't really look at it in the way that you do ie. if I don't 'rectify' my child's behaviour his adult life will be hard.
My job isn't to rectify him, it's to support him and coach him in areas that he struggles with ie emotional regulation, loud classrooms, reading and writing.
I wouldn't change him for the world, he is an amazing, funny and creative kid, and I don't see his struggles as a problem to be rectified. He has taught me a lot and continues to teach me and I don't see him as the problem, the problem is the box-ticking, winning at all costs world he lives in.