They are considered annoying, as they have no moral grounding, hence the play with words, "Pesky"+"tarian".
'Oh I c, ur a Peskitarian...'
Vegan - I'm doin myself a jacket spud with beans.
Peskitarian - I thought I could go and get fish & chips.
Veggie & Vegan - WHAT!!!
Veggie - Vegetarians don't eat murder victims, remember that song Meat Is Murder.