That’s exactly how they can get through life thinking 300 lbs is “not too much.” Because people tell them nothing is their fault or within their control. Therefore, her being 300 lbs and breaking a chair is “not her fault” and “not within her control.” She actually says as much when she (very briefly) considers paying for the chair, but then thinks better of it because it was actually the chair’s fault because it was “sub-standard.”