Of course. There are certain "mindsets" which are driven by the level of wealth you grow up in as a child which are hard to shake, regardless of your current income level, in adulthood.
I came from a comfortable (but not rich) middle class family: we had ups and downs financially but I never had to worry about having enough to eat or that my parents wouldn't be able to afford school uniform. We had holidays etc and my university fees were paid for. I didn't have everything I wanted, but I never really suffered as a result of lack of money.
My partner grew up in breadline poverty (but is now middle class). Our respective attitudes to waste are very instructive.
I don't beat myself up about throwing food away. I try to avoid doing it and don't do it wantonly but if I end up not eating every last scrap I don't lost sleep over it. It's not, in my view, worth eating food you don't want in order to minimise having to throw something away. I realise this makes me lucky.
My partner is obsessive about saving food and Tupperwares everything within sight, is very creative about reusing stuff if it doesn't get included in a meal and has a cow about stuff being thrown away if its good. Even though as a household we can comfortably afford to throw food away, it goes very much against the grain for him. And within reason I try to respect that.
And there are equivalent things higher up the income scale. My boss says she "can't function" without four foreign holidays a year. To me this sounds unbelievably spoiled and luxurious: I've had two in the past four years. But that's her "normal". Everyone's "normal" is different: I'm sure my boss considers me to be very lower class.
You just have to apply a bit of common sense and empathy and not throw out pointless advice to people about their lifestyles without the benefit of knowledge of how they live or what they can afford. But anyone who is doling out advice like "you should just buy a house" is daft anyway.