FYI, many people have and are taking this position. More folks are every day, even those who voted for him because they believe he has betrayed them. People have multiple reasons for saying this. Many of us believe he is an affront to the office, he is a brutish, unpolished, and more. He is unqualified to hold the position. No one I know believes this is a childish comment to make, except some folks like yourself who disagree. I have no problem with his being your President since this is your choice.
Many people took this position as soon as he was elected in 2016, so don't give me that BS that it's because he "betrayed" you or anyone else. It's just election denial. A refusal to accept the fact that he won. Twice. And it's childish. I don't care how many people do it.
I didn't vote for Obama, but he was my president. I didn't vote for Biden, and I despise him for being directly responsible for death of 13 American patriots in Afghanistan, but he was my president. I voted for Trump and he is my president. Thank God he won.