It's like clockwork - you can almost set your watch by someone responding like that to pointing out the obvious that human population is straining global resources and making life worse for everyone.
I like to phrase it as this: who is the ecofascist? The person advocating for sustainable human population, or the person telling everyone we need to tighten our belts, give up meat, eschew fossil fuels and personal transportation, and live like a pauper in a cheap cookie-cutter dystopian apartment complex to prevent overconsumption? I would argue it's very much the latter.
Personal ethics aside (not everyone wants to eat meat and burn gas), everyone could live like a modern-day billionaire if there were fewer people. Everyone could have beachfront and slopeside property. Can't do that with 8.3 billion people. Isn't that the goal of fully-automated luxury gay space communism?