I think it is immoral to expect me to increase my workload by a ton through cooking, when I don't even have the time to take care of myself thanks to capitalism. Sadly, due to enormous subsidies meat is cheap, readily available and vegetarian/vegan options are scarce and overpriced where I live.
Added to the fact that the effort vs impact table is pretty much meaningless when you assess all the damage to the world that the rich are doing, it just feels like a gargantuan waste of my energy and resources, to not even move the needle.
And I get to piss off sanctimonious, preachy people like you in the process, win/win.
Already doing that, and living a mostly sustainable life, trying to reduce my carbon footprint as much as I can without sacrificing the little joys an exploited and burned out worker can.
I hate that vegetarian/vegan options require so much work on my part and/or are expensive as hell at least where I live, thanks to the massive subsidies the meat industry gets.
Hell, if I am having a tough day, which I often do, I don't have the energy to make myself a lentil patty, just so I can eat a burger, or buy the grossly overpriced ones at the shop, but when I can buy a bag of them for less than a dollar each patty, convenience wins. That is one of the factors that made me stop being vegetarian. Got tired of all the work it takes.