Tim is a very established messy person and a pretty bad partner. I'm no Tim expert but from what I've read and heard he's a pretty bad partner, so IMO to suddenly make him a good sweet partner now he's dating a guy, is a weird choice to me. - also to add they made him tell Steph and canon he broke up with her because he realised he was bi ?? what in the biphobia?? Also maybe this is insane to say but kinda feels like they've written it into his character as a hey! hes relavent now look hes queer! that's a personal opinon though.
Why I think Jon x Jay get a pass on being super cringey. 1 I think Jon himself is a little cringey in general, and I say this with absolute love for my boy. My son. He's just a little cringey, but also Jon lost a large chunk of his teenage years to yk, being tortured and all that. This is Jon's expermental stage. He's finding himself out, but also discovering his sexuality and identity. He's learning himself as boyfriend, what its like to bisexual and in his first queer relationship. I don't really want Jay to be his Lios, I don't want this to be in end game in the slightest. But I firmly think Jon deserves his first very cringey queer relationship.
Really what I'm saying is, it feels like DC has changed Tim in order to ship him with Bernard and made some weird biphobia around it. Jon and Jay are super cringy but we are looking at a new version of Jon discovering himself and sometimes that makes you a little cringy.