That's roughly equivalent to intentionally mispronouncing someone's last name all the time or using a derogatory nickname for them. It's a light form of bullying. Unless they insist on being called "Master" or "King" or any nonsense like that, it is always best to respect people's wishes and call them the way they would like to be called.
Not even close. Telling the truth is begin honest, not bullier or derogative, and the truth is that people is complex and should embrace their complexity. Being complicated and not plain is that makes us unique and interesting.
This is nothing but a cheap excuse on your behalf for your bullying. Transgender people already way more about their real genes and the issue as a whole than you do, and the idea that you're doing them a favour by telling them the truth would be highly patronizing at least, but in reality you're just being hypocritical, because you know that they already know more about it than you anyway. It's not as if someone just decides to change his or her gender from one day to another, and you know that very well.
What you say about telling the truth is also not true in general, of course. You know very well for yourself that it wouldn't be okay to tell your boss that he's fat and ugly, even if that was the case. We lie for politeness and courtesy several times a day, and that's not just fine, it's indispensable, since we cannot always choose whom to deal with. These things concern basic values of our society that people like you choose to ignore whenever it's convenient to them. But God forbid somebody uses the same whacko principles that you propose on you and tells you the truth about you...
> Being complicated and not plain is that makes us unique and interesting.
Still, that gives you zero reason not to respect other people's 'complexity.'
You are assuming a lot of things about me (lol). I will not give you the correct answers
> the idea that you're doing them a favour by telling them the truth would be...
Should they be provided with a comforting lie instead for the rest of their lives? Santa Claus children's tales style? And you call me hypocrite and patronizer?
> you know that they already know more about it than you
Do I? Because all transgender people are super smart and all non transgender people are dumb? Sounds delusory thinking at its best, or something worse
> God forbid somebody uses the same whacko principles that you propose on you, and tells you the truth about you...
There is also the option to just stand criticism like and adult, and do not care about what a strange says about you. Some people could even benefit from adopting this point of view, but I must admit that shatter like porcelain at the tiniest injury or frustration perceived or imagined is also a popular choice nowadays.