Lol. The vast majority of vegans don't do anything like that, including the guy in the video linked, but the ones who do are the only ones you hear about.
If certain activists discredit veganism in your mind, would you say that climate activists who do similar things also discredit environmentalism as a whole?
Yeah? If someone suddenly showed up and they took your phone smashed it saying that Chinese kids made it and we need to protect them and so on, would it help their case or make you wanna hear none of their shit and create a need for a new phone? If part of your community acts like that it'll drag the whole community down and put a bad light over you