So there's no difference between driving a hybrid, for example, and driving a gas-guzzling Power Wagon as an office commuter? By your definition, it would seem only a mountain ascetic who survives on air has any right to call out bad environmental practices.
Is it that hard to stay off of the coral? Is it that difficult to not poke wildlife? Does someone who eats fish have no right to admonish those who do these things? Every human action has an environmental impact of some sort. We can't let the perfect be the enemy of the good.