There's a lot of food that is not meat-based that people can eat. For instance, Thai food is generally vegetarian.
The problem is that Americans tried to substitute meat dishes with meat-like vegetarian dishes, which generally don't taste all that great. In fact, one could argue that many traditional American dishes don't taste all that great to begin with which is why the lots of meat.
A simple dish of spaghetti or pasta with a tomato, pesto or aglio e olio are great options.
Also, one needing necessarily 100% remove the meat. Is 75 or 80% reduction in meat intake allows one to continue to eat meat, while still vastly reducing the amount of meat you're eating. Since one's impact on the global economy and meet consumption as a totality is infinitesimal, the reduction itself is significant even if you don't completely eliminate the meat from your diet.
I think most people would find this a hell of a lot more palatable than going cold turkey vegan and even banning honey from your diet, which many of my vegan friends have done. As well as not eating any sugar because they claim that sugar is made from animals somehow...
There is a lot of misinformation in grandstanding when it comes to diet politics which just borderlines on the silly.
People should do what they can from a realistic perspective, well not killing themselves or making themselves miserable from their political driven lifestyle choices. I know quite a few vegans and vegetarians who have decided to quit being a vegan or vegetarian simply because over the long haul it made them unhappy and eventually they wanted to eat meat again. Now they eat more meat than I do who I would consider myself a light meat eater.