As one example, flouting your skepticism in r/atheism is easy.

Coming out as an atheist in the Bible Belt without living on r/atheism first?

Orders of magnitude more difficult.

Being a pro-social justice liberal in the universities is trivial - the whole social environment supports it.

Be an open, conservative Catholic in one?

We are anti-slavery today because we really believe it, but let's not forget that one huge factor in us being so is that it's laughably easy to be so in the modern West.

Environment matters.