Im pretty sure you yourself know how untrue that is. People who eat meat do so mainly out of habit. Habits get engraved in your personality in a way that your ego will defend them to the death. If anyone or anything tries to change or question your habits, your ego interprets that as a personal attack.

Its not really their fault, they have all the necessary information but cant overcome the habit hurdle. It depends strongly on your surroundings and how open you are to new things. It is not in our nature to question things that ‘have always worked this way’.