If Biden were truly a good man and a good leader, I don't think many people would insult him for his errors when he makes speeches. People despise Biden with good reason. When you act like a tyrant that openly despises decent values, people will look for small reasons to insult you. Biden is actually worse than many tyrants in history because there were many tyrants that wanted to improve their nation and simply believed harsh measures were fine (Qin Shi Huang in China is an example). Biden doesn't fit this standard.
Also, people forget how often Bush and Trump were insulted for very minor things. Look at the focus on Trump with the umbrella not covering his wife. Trump and Bush were also corrupt leaders that didn't really care about the average people (although Trump was the best of the 3 by far) which meant they were open for ridicule. Most people were afraid to insult Obama because it would have risked them being called 'racist' so he was lucky in this way.
Let's go Brandon!