This is all a bit silly.
Seat belts are there to be worn, whatever the conditions. I'm ex-mil and got into the habit of wearing a seat-belt in an aircraft well before it became mandatory in the UK for car drivers. IT SAVES LIVES, that's why the militray fit them, among other reasons.
Yes, I am that old! Yes, I am stuck in my ways. Yes, I am still alive
and so are those people reading this, seat belts or not. But some of you wouldn't be if you'd ignored the sign.
Grow up!
Flaps has a valid point and macho posturing does nothing to calm pax who might otherwise have obeyed the requests of CC.