The post that this thread is replying to uses the phrase "know it all" and it's pretty obvious what OP meant.

The person kvetching at you about not understanding threading is making a joke because there's also a process called "eyebrow threading."

HN is supposed to be high quality discourse and you have to be on your toes if you want to participate!

Missing context, and missing references, and doubling down when you're called out is NOT the optimal strategy.