Not only do you jump to an insane straw man.
It wasn't an insane strawman though? It was literally the argument they made. Something has to die for you to eat, therefore it doesn't matter how many things you kill or how necessary those deaths are. The fact that you must kill something absolves you of any guilt for any amount of killing, is the ridiculous argument the person made (and which carnists often make) which we are making fun of for being obviously evil and wrong.
If you actually believe harming plants causes them pain and that that is bad, you should be vegan. Animal agriculture harms far, far more plants than any plant agriculture ever could.