Heh heh 
“Nobody likes a tattle tale” has multiple meanings. Mostly it’s, “Figure out how to deal with this shit on your own.” or “Figure out how to deal with this shit on your own, like we taught you, because your brother is just trying to get under your skin to annoy you.”
My wife and I raised our kids before the age of the helicopter parent, and while we were there for them when they needed us, sometimes kids think they need us when they don’t. That’s where this phrase comes in.