I'd also challenge "unhinged" - the oppressive systems we all live under are designed to make this shit the norm, they not only breed and encourage racism, misogyny and the rest, but reward those with the privilege and sense of entitlement it gives who do them "best", it's why people in such positions can and do say such things, and suffer absolutely zero consequences.
(to be clear, I'm not condoning the behaviour or saying it's ok in any way, just that these people are not "unhinged", they are acting exactly in the way white supremacist patriarchal capitalism normalises and encourages them to)
Good for them for taking a stand against consumerism, but their personal shopping habits (even collectively, they equal less than a drop in an ocean) aren't going to change neither climate change, nor inflation.
This idea that "every little helps" is just more of the same "personal responsibility" those who are actually responsible but refuse to be held accountable push on to the rest of the population to distract us from their own actions.
The only way to fight climate change (and be rid of the artificial concept that is inflation, which is there solely to make the rich richer) is by removing the cancer, rather than continue to apply band aids to it, and abolishing capitalism.