reasons for non vegetarians justified???

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i know the history of man kind.to survive he had to kill animals and eat meat .there was no other way to survive at that time.but what about now in 2017 we are civilized .i am nothing against non vegetarians but i just have a thought and i will share , i might be wrong in this also. yesterday when i asked my non vegetarian friend why do you eat meat,i mean we have so much vegetarian food but why do you have to kill an animal to eat it?? his reply was "meat taste better than tuna or any vegetarian food". i was like seriously this reason justified to kill innocent animals?? at least non vegetarians should find a good reason to eat meat. i know some people argue that plants also have life also why are you killing them?? well the answer to them is that sorry my friend you are immature and i don't want to argue with you. if some aliens(if they really exist) use humans meat as food ,i definitely support them because you know human meat might taste better for them!!