As I'm sure most here have experienced, carnists love trying to use this argument and, for whatever reason, wholeheartedly believe that it's so compelling and bulletproof that our vegan lifestyles will evaporate before their eyes in sheer awe of their flawless logic. Something to the effect of:

"Well growing plants requires farm land. And farm land requires destroying nature and killing animals." (Checkmate)

Now obviously my (and anyone else here) response would be, "Yes but it takes significantly less land and energy to grow a plant that you eat directly rather than growing enough plants to raise animals for slaughter."

I'm not mad about how brain dead their logic is, but rather how lazy they're being. All they have to do is think, "what could this vegan possibly say in response to this?" And if the above statement isn't the first thing that pops into their mind, then maybe they should get their GED. If you're having an argument/discussion, you should be thinking about what possible responses your statements will elicit. And then you should adjust your statement if the response you imagine is good enough to disprove your argument. If you're not doing that, then you probably don't actually care and just want to shut down anything that challenges your lifestyle.