besides challenging the obvious neglect and emotional/physical abuse from his father, there's also another significant aspect to harry's character that comes in the form of toxic masculine dynamics. in harry's entire life, his father has been the linchpin. the one aspect keeping it all together is about how much of a man you can prove yourself to be.
harry is, for all intents and purposes, norman's complete opposite. where he is cold, harry is emotional; where he is calculating, harry is rash; where norman is highly gifted, harry proves himself to be only average — skilled, intelligent, and cunning, sure, but nothing that has him stand out in the fashion that norman would've liked. none of these are qualities of a "real man". a real man takes what's theirs, does not yield, is powerful and most important: successful.
his son has not grabbed life by the reigns — has not shown a metaphorical killer instinct to achieve great things, to be worthy of his accolades, to be worthy of being his son — and thus, in norman's eyes, fails to be even half the man he expects him to be. in his words: weak, sniveling, whiny, emotional, on another planet, spineless. he is not a man, barely a son. couldn't mold him into what he wanted, out of his control. norman emasculates him with disparaging words, petty remarks, and back-handed compliments.
and so harry hides his insecurities. he hides it by lashing out when even slightly provoked. hides it by pushing others away. by acting as though his shoulders can carry a weight they're not fit to handle — to be the man society and his father want him to be. defending any admonishment to his father's name because that's what he wanted to be. so badly he wanted to conform. the picture perfect successful everyman. to perform his role in society. with the women he dates he wants them to conform with him as well. and then, at his breaking points, hides behind the goblin persona because to him, that persona means power. it means control. it means tossing away who he really is and hiding behind a literal mask and vanish away into the power fantasy that being the goblin is. everything he failed to be. really, it's about how performing toxic masculinity — especially under the flavor of w.a.s.p-y americana — fails and is damaging. and he only does it because he thinks it'll earn him love and respect.
one thing though, harry will always love his father. a part of him will always want his love, his respect, his recognition. to be seen and not seen through. he stopped actively seeking it, but one day, his hopes that it'll happen. he's made peace with that. though, he's still his father's son, and by his own merits, he will achieve peace and more. being an osborn isn't about success, nor is it about pain. it's being resilient — that's what he chooses to take from the hardships he's risen through, like his father before him. norman osborn is what happens when you've been failed and then fail others. harry, thinks, that he should be what it means to be failed, fail others, yet still have the hope to make it right.