The "new" math on full display

So, I’m at Walmart, scanning and bagging nearly $300 worth of groceries while the employee who’s all for $15 an hour just stands there "monitoring." Then this gem of a conversation happened:
Her: "Why are you double bagging all your groceries?"
Me: "Excuse me?"
Her: "You’re wasting our bags!"
Me: "If you don’t like the way I’m bagging, feel free to come over and do it yourself."
Her: "That’s not my job!"
Me: "Okay, then I’ll bag my groceries how I please, if that’s all right with you."
Her: "Why are you using two bags?!"
Me: "Because the bags are weak, and I don’t want the handles to break or the bottoms to rip."
Her: "Well, that’s because you’re putting too much stuff in the bag. If you took half of that stuff out and put it in a different bag, you wouldn’t need to double bag."
Cue me, just staring at her for 10 seconds.
Me: "So you want me to split these items in half, so I don’t have to double bag?"
Her: "Exactly."
Me: "So I’d still be using two bags for the same number of items."
Her: "No, because you wouldn’t be double bagging."
Me, pressing two fingers to my left eye to stop it from twitching.
Me: "Okay, so I have a jug of milk and a bottle of juice double bagged. If I split them into separate bags, I’m still using two bags."
Her: "No, because you’re not double bagging, so it’s not the same number of bags."
Meanwhile, the crowd of fellow customers is loving this show.
Me: "Is this that Common Core math stuff I keep hearing about?"
Her: "Never mind, you just don’t get it."
And with that, she went back to her podium to resume texting, or whatever it was she was doing before critiquing my bagging "skills."