In response to a friend trusting you with something that has a good chance of putting their life at risk, you centered your perspective on a) your lack of belief in reality, b) how it affects you, and c) whether or not you personally approve of the decision. You consciously and openly misgender them after knowing the decision they've made, call them deviant (even with your innocent interpretation, that's not a thing you call a large group of people, and given your age, you should know the context of calling LGBTQ groups "deviants"), and then regress to believing that you are being intimidated because others would like you to do the bare minimum involved in respecting someone you supposedly consider a friend.
Of course, Kyriakos will say you're a respected member of the community, as though that changes anything. Harmful beliefs and actions are harmful. In fact, if we take his argument at face value, it simply makes it worse, as people tend to emulate figures (hey, this is relevant to the thread!).
Very little is expected of you. You're even free to be transphobic. There's just the general base expectation that you keep it to yourself, and while in public and interacting with other human beings, you don't impede someone's ability to exist and you don't dehumanize them. Continue thinking trans people are deviant and something to be corrected. Just leave them alone while you're thinking it. It's not your right to decide that they are subhuman. Is that intimidation? Maybe. Consider how these supposed deviants feel when people like you debate the legitimacy of their existence, when the very fabric of their identity is called into question and put into the spotlight for investigation, to see if they've passed some arbitrary test in someone's head who already thinks the worst of them. They must feel really intimidated, especially when the government constantly passes legislation against them to bankrupt them, to impede them, to discriminate against them, and when other governments elsewhere in the world wholesale execute them. But, then again, people ask that you use the proper pronouns, so who's really worse off here?