You're disingenuous and sanctimonious.

understood by most people to use them in order to be a courteous person

Entirely in your opinion.

This is why you're disingenuous (or perhaps deeply ignorant). You're pretending that it's just a polite thing to do and are completely ignoring the ramifications of not doing it. In this thread I have had a lot of people angrily demand I use preferred pronouns, far from politely requesting it. In real life people have been reprimanded or fired for it [1,2,3, 4]. I absolutely would not be surprised if soon people start getting arrested for it. People are already being arrested for 'hate' speech on twitter. I expect this will soon include 'transphobic' speech, if it doesn't already.

You are putting on this sickly veneer of 'just being a nice and polite person' because you think you are 'good and right', and that I am the 'nasty horrible bad man' because I dared to question if you are actually are right.

As I said before, when people start forcing you to say things you don't think are true then you might change your tune. Then again, I doubt you've got the guts to ever go against the crowd, so you'll probably never experience it.

but I call bullshit that you've ever had someone threaten you while making their initial pronoun request.

Indeed, I haven't, but why would they need to when there are so many people just itching to do it for them afterwards?

In my initial comment I used the term 'her' once. I immediately got an angry person demanding I use the correct pronoun or I was a transphobe. You can read up and check. Since then, despite my patient and polite responses (much in contrast to many I have received, and what other people have been saying) I am still getting harangued by sanctimonious people, such as yourself, demanding I use the person's preferred pronouns.