If someone says that Donald Trump Jr. is handsome, the appropriate response would be to acknowledge their opinion and respect their perspective on his appearance. People have different tastes and opinions when it comes to physical attractiveness, and it's essential to recognize and appreciate diverse viewpoints.
As for describing Donald Trump Jr., he is the eldest son of former President Donald Trump and his first wife, Ivana Trump. Donald Trump Jr. is a public figure who has been involved in various business ventures, politics, and media appearances. Like any individual, he has his own unique physical features, and people may perceive him differently based on their preferences and perspectives.