Well now, let’s unpick this.
You say ‘how often it was to see someone drop the Host’. How often, exactly? Every Mass? Every month? I think in over 40 years I have only seen this once.
You say ‘laugh from being embarrassed’. Some people do laugh when they are embarrassed. They are human, they don’t do it out of irreverence, it’s just a nervous tic…
You say ‘pick our Lord up’. What else could they do? The priest can’t bend down in case the ciborium gets tipped up and something even worse happens, but the Host can’t be just left on the floor…
You say 'pop Him in their mouth '.Again, what else can they do? The phrase ‘pop Him in their mouth’ could be replaced with ‘hastily do what should have happened the first time so as to retrieve the situation’.
You say ‘go back to their pew like nothing happened’, Well for one thing, you don’t know what distress and embarrassment they could be feeling. And anyway, again, what else could they do?