One of my dad's favorite jokes went something like this:
Somebody would mention a "hot water heater".
Upon such an utterance, my dad would immediately correct them and say "it is called a water heater, not a hot water heater. know why? because you don't need to heat hot water!"
And he felt himself very clever for saying things like this.
Everybody else just thought either A) he was a clever, funny person; or B) he was a jerk.
Generally the folks who thought he was clever were new to experiencing him, and anybody who had been around him for any significant length of time just thought he was a jerk.
Please notice that I did not make any mention at all about his factual correctness, for indeed he was factually correct.
I tell you that factual correctness is not equally prioritized by all people. Many, if not most, people think that a person who feels an overwhelming need to be factually correct is a pedantic snob or jerk, like my dad was.
I myself am a recovering pedantic jerk. I tell you that I was (or thought I was) nobly intended. I thought people wanted to be factually correct. They more often than not don't care about the difference between things like cement and concrete, and just see those who insist that terms are used correctly are "making them feel dumb" or "being superior" or "pompous". It is almost never taken in the spirit of helpfulness.
This has to do with being a layperson or an expert in a particular area. Most folks don't see a difference because they have had no need or desire to be educated on it.
In social media, such pedantry often erupts into flame wars, so I strongly invite you to consider the following course of action:
Do nothing. Leave it factually incorrect. It does no harm.
Or insist on factual correctness, and this will build a reputation for you and make the impression that it makes on others.
P.S. This answer does not care about the difference between cement and concrete, and I live in a place where the two terms (by laypeople) are used interchangeably.