OP was making a fair point that not everybody has the same amount of time and energy (or money) to tolerate shifts in their routine, which in the context of a "personal vs collective responsibility" style argument is entirely reasonable.
By the same token, if only the _rich_ have the freedom to make such behavior changes for the sake of conservation it will only ever have a token impact, and in many cases the "correct" level to make an efficiency pitch at is the community: a decent light rail system will always outperform everyone driving their own vehicle to work/the store/downtown in terms of space and energy efficiency.
...but, to get people to buy into such "collectivist" systems, you often have to get them to contend with some perceived reduction in personal convenience: yes, a train doesn't need a parking lot and uses less gas per passenger-mile, but then you're beholden to the train schedule. It's exactly _that_ sentiment that I find frustrating in advocating for sustainable civic design.
To OP's point: whatever that "collectivist" option is necessarily has to contend that standards of accessibility and convenience are not constant across the population. That doesn't inherently mean "the poor should consume more," but that "hang dry your laundry" isn't an option for everyone in the current dominant socioeconomic structure.