The topic of this article from 2012 reminds me of that common saying: "You're entitled to your own opinion but not your own facts" but it takes it to the next level. [theconversation.com]
In case you were wondering where President Tweetybird gets his ideas:
“When I use a word,” Humpty Dumpty said, in rather a scornful tone, “it means just what I choose it to mean—neither more nor less.” “The question is,” said Alice, “whether you can make words mean so many different things.” “The question is,” said Humpty Dumpty, “which is to be master—that's all.”
Obviously trumper never heard of this statement but it would not matter as he does not believe in facts only what he makes up.