You could try to reinforce "environmentalism != feminine", and that's certainly easier. But there is still a great deal of wrongness in "feminine == unacceptable" and you choose to ignore it, even perpetuate it, by changing your tune to appease fragile men.

Protecting the environment is liberal and unmanly, unless you're a Republican in a Rocky Mountain state.

Magically, over there environmentalism is a Republican value, too. Funny how Republicans don't worry about liberal and unmanly when an issue hits them, personally.

The problem with so many Republicans is that they can't conceive of being on the other side of the coin until it smacks them over the head.