You absolutely, 100% can be an a good advocate for corporate and collective responsibility without having good personal behaviors and we NEED the people who behave exactly like this if we want the planet to have a future.
If they can't handle it now at least in some degree, then I don't see how they'll be able to handle it in a much worse degree after we make these large reforms and changes. My fear is that these people will turn away from us as soon as things get too hard and run into the arms of the first strongman who tells them they'll make it all better.
I also do not see it as gatekeeping to ask people to do better. Nobody is saying they can't vote with us. We're just asking them to not wait until forced to make at least some changes.