a convincing “argument” :/

As a non vegan can I ask why some vegans feel the need to push their views onto other people? I eat meat for the simple reason that I like it, but since my stepdads brother moved in (turned vegetarian a few months ago and has just become vegan) he feels the need to project the fact that his views are right and no one else can have their own views whilst at the same time refusing to listen to personal beliefs that anyone else has, because they are and I quote “too stupid to even discuss that with” I have respect for him trying to help the planet by going vegan but is there a way to get him to stop lecturing about it and dismissing his own family because they still eat meat?

/r/vegan Thread Link - i.redd.it