I don't have children, I don't drive them to school in a SUV or to a holiday in DisneyWorld, I have never launched a SpaceX rocket, or lived on my own in a full size house. I have never been on a cruise. I don't live or work in an air-conditioned place.
To put it bluntly, f' off about calling people "the most severe cause of climate change" for eating a beef sandwich without considering anything else. It's unhelpful, provocative, and completely incorrect.
I didn't attend an international destination wedding this year, which a lot of my family did. How many bacon sandwiches does that earn me compared to my family?
If your answer is none because climate change is a global catastrophe and everyone has to pitch in, then what incentive does that give anyone? If any carbon slack of my reduced comfort is just getting eaten up by other people's indifference, aren't I better off being indifferent as well?