I may just bear a bit of a grudge against Gaku for this line, honestly.
At least Hiruko had the excuse that Takumi sounded as if he didn't know what he was talking about where it came to personal matters, while Gaku was fighting for the sake of being contrarian- it doesn't actually matter to him if Takumi grew up in a happy situation or not, what matters to him is weaponising his perception of Takumi's privilege in order to undermine and shut him down. It's shitty behaviour even without factoring how presumptuous that is of Takumi's background.
Frankly, it has to be said that Gaku knows only enough about Takumi to register that he grew up 'in close quarters with a babe', as he might put it- if he even knows that much. What's more, some of this event has Gaku bemoaning the fact that he 'can't have a hot babe to look after him' (well, a mother), so of course if he knew about Karua in passing, he would especially not care if Takumi had any sort of problems at home.
If we got into the issue of Gaku's commentary about women, we'd be here all day...
Takumi meanwhile, is not exactly in a position to counter Gaku- besides that this is not the time or place during a Persuasion event, whatever problems he has he tends to keep to himself, minimise or worse still, be completely unaware whenever something is evidently wrong with him. He's exactly the sort of person to have festering issues that he can't quantify, as well as some heavy self-esteem issues, which means he'll very likely shut down when others minimise him thoughtlessly.















