Describe what common sense means to you.

Common sense is almost never based on fact, but is usually used to explain away "things that we've always done" as normal or more acceptable than the alternatives.  Rarely, common sense actually aligns with whatever research may or may not have been done on any given topic, and that is "good" common sense.

Often, and unfortunately usually, however, people don't bother to ask themselves why what they think is right, and will not listen to arguments against their own beliefs.  Or, they will listen to the arguments, but then respond with a completely illogical answer, such as, "My religion says it has to be this way, so you can't do it another way, even if you don't believe in the same things I believe in."

In other words, "common sense" is often neither common, nor sense.