Yes, it does irritate me when people try to imply that healthy eating HAS to mean things like salmon steaks, organic chicken breasts and blueberries.
I think the problem is often that people who are used to eating a lot of relatively cheap junk food, don't actually like veggies much, if at all, don't know how to make cheap meals from scratch, and maybe even aren't prepared to do a lot of peeling/chopping up - not uncommon regardless of money.
I used to have a comfortably off (largely non cooking) colleague who asked me for a recipe for a particular soup - she complained afterwards that her arm had ached from all the chopping! All it had involved was one large onion, a few carrots and a couple of sticks of celery.
Having been exceedingly broke in the past - thankfully a long time ago - I know I could feed me and Dh healthily on very little if I had to. It would involve a lot of cheaper, seasonal veg, lentils and pearl barley, etc., the cheapest cheese and eggs, and probably the odd chicken, of which every scrap would be used. Chicken and eggs would have to be non free range, of course - I haven't bought non free range for ages - but needs must.
At one point in the very broke past we were practically living on very substantial seasonal-veg soups, with bread and the cheapest cheese. My Dh still loves this sort of soup and I still make it a lot in winter.