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Biden’s political career spans six decades, and like most politicians, he entered the field knowing what to expect. So, he’s developed a thick skin that insults bounce off.
On the other hand, trump is easily insulted and extremely vindictive. Because of this he, and his thin-skinned trump Nazis, believe their stupid remarks annoy Biden. They don’t. His job as POTUS leaves little time to follow the trump Nazis’ stupidity on social media.
As for trump, his many so-called “accomplishments” while squatting in the White House are in his imagination and that of his trump Nazis. In fact, Biden acknowledged trump's only positive act, to which trump's reaction to recommend his trump Nazis get vaccinated only pi$$ed them off.
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