Because you don’t like seeing people promote lifestyles that are objectively necessary for human life to be sustained on this planet in the long term?
Or because you don’t have the discipline to overcome the upbringing that conditioned you to feel addicted to meat consumption, and you subconsciously realize that veg*nism is the morally and ecologically superior lifestyle and that leaves you with an inferiority complex that makes you lash out at others like an upset child?