If you need people to be nice to you to convince you, you care more about appearances than the argument. If people being rude stops you from acting on something you actually believe in you won’t last a month as a vegan.
Going vegan means changing your habits, giving up a lot of your treats with nothing in return. You will be the weird one at christmas that needs “special” catering, people have to choose restaurants based on your habits and you will be the butt of a lot of jokes simply because you care about animals not being enslaved. If you need people to be nice to you, and applaud you and make you feel all warm and fuzzy to keep that going you won’t last.
The first lesson every vegan needs to learn is: there are no rewards and no one will compliment you. You are doing this out of your own conviction and not for anyone else.