Common sense is usually one of two things

One: your self preservation instincts

Two: ability to understand social clues and responding accordingly

The problem is that common sense isn't all that common. In Denmark we say "healthy sense" instead.

I rip into people who say "common sense". It's often used by people who aren't good communicators.

I've found I like interpretating phrase "common sense" akin to this scene, from blazing saddles.

https://youtu.be/KHJbSvidohg

I hate the phrase in political contexts.

"We need common sense (insert) laws!"

In other words, you either agree with me or lack common sense.