I don't think I'd classify Claire's personality as aggressive, rather I'd say assertive. I agree too that it's a necessary trait of folks that do the kind of work she does.
Eric doesn't seem to realize how exceptional he is in the changes he's made to his life. At the same time Claire, Adam and Andy don't seem to understand what it means for Eric to accept "charity". He has subsisted within his means and if that meant doing without well then do without he did. That was a common trait among folks of my grandparents generation and even my mum. My grandparents, like Eric, were rural farmbased thoughout their lives. They survived the Great Depression and the deprivations during WWII. They got by with what was available. As a boy my maternal grandfather ate poached venison. His people were mountain folk. My paternal grandfather hunted rabbit, pheasant and deer in season as supplemental meat for the table. I myself can remember when Sunday night's meal was hot chocolate and toast because it was cheap and filled our tummys. I watched my dad eat "coffee soup", nothing more than broken up toasted bread with a spoonful of sugar, hot coffee and some milk. I helped my paternal grandmother glean dandelion greens from along the hayfields in the spring to cook up into a tasty nourishing meal. We got by with what was available. Growing up I never went hungry, my body and clothes were clean. I got new school clothes each year but also wore hand-me-downs from my older cousins and passed on my clothes to a younger boy who was the son of a friend of mum's. It wasn't "charity" it was commonsense there was still wear in those clothes, they weren't worn and shabby. Charity was for the poor folks who had less than we did. So suggesting Eric go to the foodbank for handouts was almost an insult. An assault on his dignity and self-worth. What needs to be done is to get him to see it as a benefit, like those others available to him, that provides him with some of the things he buys now so that he can use those savings to buy fruit and veggies he otherwise could not.