I read on a number of threads on here, and people comment in RL "they can do x but don't and I know they have more money than me".
How do you know all these people have more money than you?
Do you know everyone's payslip, or do you presume because of their job that they have more money, or do you presume because of their lifestyle they have more money than you?
If due to their income they have more money than you, how do you know that they don't have more outgoing commitments than you, something I'm aware of, the more you earn the bigger your bills tend to be, i.e. if you can have a bigger house, you have a bigger mortgage, you have a higher council tax bill, your heating costs are more etc. So your disposable income is not more.
If you are basing it on lifestyle, how do they know they are not living on never never credit to fund their lifestyle, or that they are being frugal in other areas (normally the one that you are complaining that they won't do x for as "they have more money than me"), to fund what is important to their lifestyle even if not important to your lifestyle.