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Actually, it is complicated. Let's pretend you know why they dislike environmentalists. Now, ask yourself this: do you dislike environmentalists? Regardless of your answer, answer why you like or dislike them. And when you arrive at the answer to why, you'll then have to confront your own lack of knowledge with regard to the subject of environmentalism itself to realize if your answer to "why" has any validity to it.
No, actually it's not complicated.
It's a bit like people who might believe in religion but they don't like snotty street corner preachers pushing bibles in their face when they walk by.
It has nothing at all to do with the knowledge base and shouldn't.