This isn't generally true of footballers, lots of them come from normal working class families and have an idea of what life is like for average people.
See Marcus Rashford for one, he is so passionate about tacking poverty because he lived through it, and he isn't an anomaly, there are so many footballers that grew up in rough circumstances past and present.
And that's why I said they have an idea of what life is like for the average person i.e. their parents and families. which is a lot more than what the original commenter was giving them credit for.