Well his soul was not completely damaged as Dumbledore said but there were no execuses for his bullying. He said Hermione, a mudblood and was Keen to switch sides in order to save his neck. He was a coward.
But yeah, as he matured and grew older like in cursed child, he realised his mistakes and got somewhat a redemption arc.
Rowling's thoughts on Draco:
."
Rowling explains that although "girls are very apt to romanticise" the "dark glamour of the anti-hero", she writes that she has had to tell fans, "rather severely, that Draco was not concealing a heart of gold under all that sneering and prejudice and that no, he and Harry were not destined to end up best friends