Hot Take: Bruce doesn't support freakyTimBer not because he doesn't like Bernard. It's because Bruce has to pretend to be the freak in all of his civilian relationships to explain away his scars, so he keeps accidentally making his partners think he's into that and then he's too awkward to correct them, and he's worried that Tim's doing the same thing.
This is genius, I love it!!! My original thought process was Bruce just couldn't fathom his babies ever having sex like?? No?? His kids!? Never U_U
But I absolutely adore this so much. You have no idea.
Pre identity reveal shenanigans (aka, before Bernard tells Tim he knows and also Tim is a goof)
Bruce, looking at the bruises and obvious bite makes and cuts along Tim's visible neck and arms: . . . So, where'd the, um, new... bruises come from..?
Tim, not even looking up from his laptop: Bernard. Bruce, I told you this already. Don't question any injury I don't put in my reports.
Bruce: You know, if you ever feel... Pressured into things—
Bruce: I understand keeping our identities secret is important more than any one, you know this, but you shouldn't make sacrifices to this degree to keep it in tact—
Tim, moving a hand over his mouth to stop from either laughing or crying, he isn't sure:
Bruce: It's important to... Enjoy yourself with your relationship safely, and consensually. If you feel like you have to do or comply with certain things for Bernard to keep your identity safe... Why are you laughing?
Tim, trying not to laugh: Bruce, I promise, anything Bernard does to me I give full permission to. Enthusiastically, in fact.
Jason, from another room, who read 50 Shades Of Gray once when he was fourteen: YOUR SON IS A FREAK WHO BEGS ON HIS HANDS AND KNEES FOR HIS BOYFRIEND TO CHOKE HIM OUT, YOU IDIOT!
Tim: HOW'D YOU KNOW THAT!?
Jason, popping his head in: WHAT THE FUCK DO YOU MEAN YOU ACTUALLY DO THAT!? I DIDN'T KNOW S#&$ BUT NOW I DO WHAT THE F$&%, TIMOTHY!?
Tim: STAY OUT OF MY SEX LIFE!
Jason: I WISH I DIDN'T KNOW YOU HAD A SEX LIFE!
Tim: I HOPE THE JOKER BLOWS YOU UP AGAIN!
Jason: I HOPE I'M CREMATED THIS TIME!