It takes a lot more than a President being rude or crude or making crazy statements to be removed from office. I am not defending the man but he is hardly our first President to be bombastic. Even FDR said and did outrageous things. The difference back then was the media was limited and reported only what the WH would allow them to report.
Truman publicly described Stalin as a “strange little man.” TR liked telling others to shut up.
The bigger question is does Trump have some kind of physical issue going on like early dementia given his age. Go back and watch interviews of him 30 years ago and he was much more grounded and coherent.