Couple other things.
Okabe's not a jerk. Especially to his friends. That, combined with the fact that Ruka kinda was the only one who could've helped out with the resetting of the time travel stuff, is why he went out with her. She wanted to have good memories. And quite honestly, Okabe pretty much had control over that present time loop anyway, he could afford like 100 time loops to try(and miserably fail) to save Mayuri. By that point, he could spare two hours to not be a giant jerk to one of his closest friends.
Let's hear the reasons and what "the problem" is then.
Because maybe people might just want actual good representation, instead of being told again, and again, and freaking again that they aren't real people, just because life decides to say 'screw you!' to having any sort of nice things.
And the problem? That you, and people like you, are close minded jerks who objectifies people and turns them into just... well, objects. Stripping people of any respect, just so the jerks can feel better about themselves. Like that 'several of my favourite characters' stunt. That's like pulling the 'my best friend is a person of colour, so I can be racist!' card, which is equally idiotic.
Well yeah, there is lighthearted parts in it, but by the time the show enters the second half, it definitely does get serious.
Like Mayuri being shot for example. There's nothing lighthearted about that. The idea that the second half isn't serious is what's "hilarious".
It's more serious, but even then it has its moments of light heartedness. Mayuri being shot is serious, though, yes; and so is Kurisu back in the first episode. Doesn't mean there's no lighthearted parts at all.
