It seems unlikely that eating lab-grown meat, for example, will be as efficient, in terms of CO2 emissions, as simply being vegan in a reasonable time frame. And it is currently not something that exists in a reasonable scale, so it’s not a “religious zealot view” to advance the current most practical, efficient, and easiest solution.
And some people who are vegan would not necessarily be against lab-grown meat, but it depends on who you ask
have you considered that maybe if 3 different people “get offended” by your comment, it might be cause you’re an asshole and expressing your views in a really dick-ish way and invalidating a whole group of people? Food for thought, maybe do some introspection