I said it was a dumb take, which is an attack on the idea. Saying that one is responsible for ones own impact on the planet isn't a personal attack either.

This is like someone saying that, since other people litter, there's no harm in me littering too. Sure, your individual action doesn't matter but collective action does.

Similarly, by your logic, why should I vote? After all, it is extremely improbable that my vote will have any impact on an election.