Why Are People So Concerned About How Others Spend Their Money?

All kinds of reasons. None of them any good.

I suspect ego is the dominant driver. Most folks think they have the only correct take on reality and since they decided this is right for them it has to be right for everyone else… and as I have said before, anyone earning more money than them, or just willing spend it are ignorant, stupid, or shallow. It’s all about them being the center of the universe.

Keeping ego out of things is hard. It creeps in in small, medium, or large doses depending on the individual. 

Keeping ego out of things is hard.

I have a very healthy ego, but years of competition have taught me to respect my competitors and enjoy the process of competition. 

@russ69 

Well as you can see, you aren't the only one annoyed by this type of behavior (I'm sure you knew that). I attribute it to simple (And common) envy and jealousy. I have zero concern or issue with how another adult decides to spend "their" money. It's absolutely no one else's business. This envious attitude seems more prevalent the last few years on this site.

Charles 

A young guy told me I had it easy with no debt and a fancy stereo. He was 25 years younger. I told him I'd give it all back to be his age again and that 25 years ago, I too had none of what I have now. It's all perspective and relative.