First of all, he's not a legitimate president so as far as I care he's not the 45th president at all. So I don't understand why some liberals keep calling him this. It seems to originate from some copypasta that was going around encouraging people not to say his name. Why the fuck not? Who is he, Lord Voldemort? Don't give him that kind of power over your vocabulary. Call him fucking Donald, call him Orange Shithead, call him "So-Called President" Trump, I don't care. But 45 is actually giving him more unearned respect than just using his name.