Trump was not just mocked unjustly... words were inserted into his statement by major, reputable news sources, such as the New York Times, which was one of the first to begin using the word 'bleach' (which is actually dangerous to inject) instead of the stated word 'disinfectant' (which is non-specific enough to be less dangerous).
https://www.nytimes.com/2020/04/26/opinion/coronavirus-bleac...
IMO, this is incredibly irresponsible. Antibiotics are a disinfectant, which are completely safe to inject. Other anti-virals are also safe to inject. The Times took the word 'disinfectant', which while perhaps used incorrectly, does not immediately suggest doing any actual dangerous action, and, instead of restricting their criticism to the fact that no known COVID injectable disinfectant exists, they linked the word to actually dangerous 'cures'. While doing so, they popularized an otherwise fringe movement, and made baseless claims connecting this movement to Trump's motivations behind saying the word (the fact that such a group lobbied Trump is not in any way evidence that this is why he used that word... lots of groups lobby presidents all the time).
Joe Biden and Obama are and were surely mocked as well, but not by the likes of the New York Times, WaPo, and other major news outlets. I mean... is the New York Times running articles on Brandon? I don't think so.