I call people by their preferred pronouns because this is something that's completely inconsequential and meaningless to me. But the same kind of argument can be made against you: "So you're saying taking "no" for an answer is a great difficulty for you?"

If I traveled to some country where a particular religion - let's call it X - was the most common, and in X people were ascribed different pronouns based on some rules or rituals, I would call them by their preferred pronouns because as an atheist and moral anti-realist that's just not something important to me. But if a Christian felt uncomfortable doing so because it goes against their religion their position is just as valid - arguably it's more valid since in this example the people from X are asking the Christian to change their vocabulary, while the Christian isn't asking anything of the people from X.