Why are a lot of vegans so self-righteous?

LovelySerene
Obviously not all are like this, but some are...

Like I was talking to someone I know who has recently became a vegan and I was telling her that I respect vegans but I personally couldn't do it.

This was her reply:
"I'm fine with that. Not my life, just like mine isn't yours. Just educate yourself, know the effects that your having on yourself and others, and understand that you're asking someone to give up their life just so you can have heart disease, cancer and momentary pleasure. That is all."

I was like What? I didn't fight with her and just ignored her...but What the hell?

ANYONE can get heart disease and cancer no matter what they eat, to say otherwise is ignorant.
Why are a lot of vegans so self-righteous?
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