I generally don't start telling professionals in a field I know naff all about what they should be happy with being paid.
I suggest you do the same.
By all means ask questions to increase your understanding, but the second you start to tell people that they are getting paid "well" in a job that you know nothing about, then expect to get a reaction.
Would you like it if I told you that I think you should be happy getting paid £3.20 and a packet of peanuts for your job, without knowing anything about it?
I doubt it.
You misunderstand me. I am pointing out that to a lot of people £45K is a lot of money and they would consider themselves lucky to earn anything like that.
I am not telling YOU that YOU should be happy with that.
No need to try and belittle others.