God allowed men to eat meat after the flood due to the fact that the vegatation had been destroyed- it was only a certain type of meat and it had to be prepared a specific way.
If you truly read the Scriptures you will see the progression but that - most only ate meat in small amounts occasionally and the majority came from fish.
The Scripture also says "all things are lawful to me, but not all things are beneficial to me"
"the thou shalt not kill... was not referring to animals" as God himself took the animals and made clothes for Adam and Eve- he also required sacrifices of animals to him. that was under his Law, (along with the sabbath day)
But that was all done away with when Christ went to the cross- for an end was put to all that right there as Christ fulfilled the law.
If people would acutally study it the Bible out you would be able to answer these questions logically and be able to stand on your vegaterianism using the Scriptures.
As this is how I do it~ many people have used these arguments with me as my hubby is a pastor... If you know the word you can lead them straight thru the Bible showing them the progression and then how it changes...
Right to " all things are lawful to me but not all things are beneficial" then ask them to prove to you how it's beneficial to...
treat dairy cows the way they do - describe it in detail
then share with them the way there beef, chicken and veal come to them... tell them about the many health risk to eating meat...
Works ... everytime they may not become veggies but they shut up ~ and many have stood up for me.