When Did Helping Someone With a Carry-On Become Such a Big Deal?

I saw a guy get into an actual argument on a plane because he refused to help someone put their carry-on in the overhead bin, and I genuinely couldn’t believe how serious he was about it.

Not just a quick:

“Sorry, I can’t.”

It turned into an argument.

His whole point was basically:

“If you can’t lift it yourself, you should’ve checked it.”

And technically…

I understand the logic.

If you bring a heavy suitcase onto an airplane,