Maybe Jordan Peterson telling them to clean their rooms reminds them of their Conservative dad's telling them too. And their projecting their hatred on to Peterson.
I'll admit that i only have a very vague knowledge of Petersons stchick but isn't it just basically telling people to grow a set and actually take control of their lives if they want to be successful?
Essentially, basic "how to be an actual person" stuff that redditors would run screaming from because it removes their perpetual victim status.