Well, I don’t believe I ever once referred to Reagan as “president Reagan”, Bush or Bush Jr. as “president Bush”, or Clinton as “president Clinton”, or Obama as “president Obama”; I reckon it’s not freaking likely I’ll refer to Trump as “president Trump” .
You, however, should feel absolutely free to call him anything you please. Also, feel free to keep letting what other people are calling him bug you or whatnot. Since, you know, you have so much control over that.
What is your problem with me, anyway?