it was mocking of eid-ul-adha by saying try vegan ,when we sacrifice an animal on Eid its because the prophet Abraham(P.B.U.H) sacrificed a lamb on the day as a test from GOD .
Abraham had shown that his love for God superseded all others: that he would lay down his own life or the lives of those dearest to him in
submission to God's command. Muslims commemorate this ultimate act of sacrifice every year during Eid al-Adha.
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seiko
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Kloitra
Imagine holding a placard outside there Temple/Gurdwara with this :
He who, even daily, devours those destined to be his
food, commits no sin; for the creator himself created
both the eaters and those who are to be eaten, for
those special purposes. “The consumption of meat
befits the sacrifice”; that is a rule made by the gods.
[Smruti 5:30-31]
He who eats meat, when he honors the gods and
manes, commits no sin—whether he has bought it, or
has himself killed it, or has received it as a present
from others. [Smruti 5:30-32]
offering them free vouchers for a new business you'd get such a beating from the Hindu posters in this thread & i wouldn't blame them not at all .