Personally I am NORMALLY opposed to making fun of any public figure based on appearance or other unimportant traits as it's distracting to conversations of actually substance.
Trump is an exception though, somehow me managed to get to office despite countless articles, testimonies and historical evidence of how unsuitable and unqualified he is. He can lie countless times and see literally ZERO repercussions. His mocking of others based on physical appearance begs for the same treatment in return.
So yeah, he deserves every tasteless meme, mocking skit and even outright lie (#GoldenShower) that the internet can throw at him. With luck he'll have a heart attack in the midst of some rage filled twitter rant.