Clary and I have always had each other’s backs. We had our entire lives. That’s more than I can say for you or Alec.
You do not get to talk about Alec, mundane!
So I’ve watched this scene many times and like many others, that “lap dog” comment bugged me. I often wondered why would he let someone refer to Alec as his lap dog, why would he let anyone demean his parabatai like that and then immediately proceed to defend Alec. But that’s just it. He’s defending Alec. Every time he spoke out against what Simon had said during that scene, it was only to defend Alec.
I care about a bunch of people. Just don’t care about you.
Me, or what… What’s it called, your… your parabatai?
Whoa, watch your mouth. You don’t know a thing about me and Alec.
Twenty bucks says he leaves you hanging tonight.
Not a chance.
Anytime Simon said anything that indicated that Alec isn’t honorable or reliable or trustworthy, you can see Jace get noticeably irritated.
But when Simon had a go at him, “You treat him like a lap dog,” he didn’t bother saying anything against it, he doesn’t care enough to defend himself. Jace said in this scene that he cares about a lot of people, that Simon just wasn’t one of them. So he didn’t care about Simon’s opinion of him. But he cared about what anyone else thought about Alec to say ‘no, you’re wrong, don’t talk about something you know nothing about’, even if it was Simon. Basically if anyone questions Alec and his integrity, or go after their bond, and Jace will have have no problem telling them how wrong they are.
(Another thing about the scene above is as soon as Simon outright said that Alec doesn’t have his back, Jace snapped. I can’t help but wonder how many instances that came to his mind where Alec did have his back in all the years that they have known each other.)