Donald Trump sent warm wishes to Joe Biden following his sad cancer diagnosis. But the president’s son has come under fire for what many consider an insensitive comment about Biden’s health. The tone completely shifted Donald Trump Jr., son of President Donald Trump, has sparked outrage on social media following President Joe Biden’s recent cancer diagnosis. What began as a seemingly respectful message quickly took a sharp, mocking turn — igniting fierce criticism online. Shortly after news broke that Biden, 82,…