"I find it interesting that many posters here decried the name-calling of President Obama and Clinton....
....but have no problem with calling Mr. Trump names like "President Moron" and other nasty plays on his name.  Can you explain this seeming hypocrisy?"

With ease.  Obama and Clinton are superbly qualified to be president.  Trump is a failed businessman and "reality" TV gameshow host with no experience of any meaningful kind.  Furthermore, Trump is a confessed sexual predator as well as pathological liar.