I hate to cry "not all ______," but I feel compelled to do so. A lot of vegetarians, like me, make no comment about other people's eating habits. If there is an open conversation (like this one) about diet or someone directly asks me, I may chime in.
Further, be it about diet or any other social/political/environmental issue, the "I do this because I like it, am lazy, and am imperfect," as stated in the video, has its limits. Our society is entrenched in a host of behaviors that, while normal, are severely impacting our environment and the welfare of our fellow citizens. Visible, consistent breaks with these norms by large groups of people are the only way to redefine normal and strong, immediate breaks may be the only way to make certain changes fast enough to have the needed impact. Forming new habits and points of view is difficult, but once it is done, it becomes your new norm and takes little thought or effort - just like starting a new workout or course of study. With many collectively saying "it's too hard" for any given social change, I have to ask
1) Is it really too hard or is it just inconvenient? I will use vegetarianism as an example, but this can be applied to almost any social/environmental issue.Switching to a vegetarian diet or changing any habit may genuinely be too difficult for a single parent with a limited income who lives in a food desert, but it is likely simply inconvenient for a middle class childless couple.
2) Will the inevitable outcome of following social norms/being lazy be harder to live with/more difficult to live through than the discomfort of making said change?
3) Does your "liking" of said thing justify the potential harm it may inflict on others or yourself in the furture?
Relatedly, just being vegetarian has a limited impact environmentally speaking if one still consumes foods that are imported from long distances, utilize massive resources (like almonds due to their massive water needs), etc. Research into a more environment friendly diet is needed - and such a diet may still include some meat (assuming the environmental impact is one's primary concern when considering vegetarian/vegan diets rather than animal rights and cruelty) and be more environmentally friendly than some plant based diets (though by no means all).
Whether you eat meat or not, if you are concerned about animal rights and cruelty, I would recommend starting with researching pig farms (which are also some of the biggest offenders when it comes to polluting rivers and contributing to desertification) and moving from there. Some organizations' materials/information may be sensationalized (PETA), but other have some quality information and provide resources for advocating for better farming practices (The Humane Society of the United States).
Whether you eat meat or not, while considering better farming practices, I highly recommend looking into how current corporate meat farming models - particularly poultry farming - under compensate and even harass the farmers with whom they work. I live in a farming community and grew up in a farming family, so I know first hand the plight that farmers face, how nearly impossible it can be to farm independently, and the atrocious way agra-corps treat the farmers from which they source their product (particularly meat farmers).