What a sweeping statement.
I'm tall and a size 6–8 depending on the shop. I eat carbs including bread, rice, pasta, quinoa, cous-cous...
I have two big slices of toast for breakfast, with cheese, avocado or pate. I eat a sandwich for lunch most days (meat, fish, cheese, anything really). For dinner most nights I'll have home-made pastas, curries, stews etc, often veggie but sometimes with fish or meat. About once a week I'll have a takeaway –fish and chips, pizza, chicken.
I eat cake or biscuits, chocolate and crisps most days. I'll also have a couple of pieces of fruit a day.
People have said that my portion sizes are large; my household and I (none of whom are overweight) think they're normal. I don't really know what that signifies!
I only do about an hour or two of vigorous cardio exercise a week, plus some gentle yoga, and I don't drive so I walk a lot.
So yes, I think YABU and jumping to massive conclusions.