GABRIEL AGRESTE DOESN’T DESPISE HIS SON.
I know it sounds crazy after Chat Blanc but hear me out.
We saw earlier the whole scene in “The Collector” with Gabriel going “Where is my son? He’s the most precious thing! Nothing must happen to him!” or whatever. We also see when he joins Adrien on the piano so they can play together. We also see him leave his house (!!!) in “The Queen’s Battle” to go and hug his son after he saw the danger he was in, and almost (almost) gave up being Hawkmoth for Adrien’s safety.
So no, I don’t think Gabriel hates Adrien. He loves him, so much, and it is proven multiple times.
“What about Chat Blanc?!” you may scream. “He played baseball with his son!!! He manipulated and hurt him!!!”
You’re right! Gabriel does love Adrien, BUT when it came to choosing between Adrien and Emilie, Gabriel loved Emilie more, and didn’t hesitate in choosing her over Adrien. I’m not saying it’s ok - Gabriel is after all a pretty messed up person - but it’s what makes sense; he just doesn’t love his son as much as his wife.
Alright, cool, now we have that out of the way ... this leads me to another theory:
Gabriel doesn’t love Adrien.
“Dammit, now you’re being ridiculous!” you may now be yelling. “Is this a paradox or something?!”
We saw how OBSESSED Gabriel is with getting his wife back. We saw the sacrifices he made and the risks he took just to beat LB and CN. That man can be described as crazy, no doubt. His immovable and unhealthy love may have crossed its bounds ...
... and poor Adrien has to suffer because of it.
Maybe Gabriel doesn’t love Adrien because he’s his son or for his own person. Maybe he “loves” him because of the Emilie in him. He has his mother’s eyes, smile, hair - he is a carbon copy. Maybe Gabriel “loves” Adrien because it’s the only thing he has left of Emilie, or because it’s the closest thing he’ll get. Maybe that’s why he was so intent on “nothing happening to [Adrien]” in “The Collector”. Adrien is temporarily holding Emilie’s place, not because he’s his son but because he’s her son.
(You know, kind of similar to the way Severus Snape protected Harry Potter purely for the Lily [Evans] in him, and would have cared less about the boy if it wasn’t Lily’s.)
And I think that’s pretty creepy, but if you ask me Gabriel is a creepy man.
MatPat voice: But hey! That’s just a theory!
(I’m very convinced though.)