This is basically the Nirvana fallacy. While maybe you need to make some compromises (e.g few of us can afford clothing that likely doesn’t involve child labour) you can make real, positive change. In clothing for example you can get second hand stuff, or just choose to have fewer items. Regardless of the difficulties with clothing nobody would say "I can’t afford an ethical parker to survive winter, therefore I will punch a stranger in the face as you can’t be perfect.

you can make real change, veganism is about what is practicable. Nobody expects you to die because the world is set up in fucked up ways and your BP meds were tested on animals or whatever but you can avoid animal products without perfect replacements. You don’t need to replace chicken nuggets with plant nuggets, you can replace them with daal nutritionally…