Jason, he really doesn't like his birthday, and he can't even remember when his birthday was, but you remembered. You even baked him a chocolate cake. He loves chocolate cakes, or maybe he loved them? He doesn't remember much since the day he came back to life. Let me rephrase that; he doesn't remember much of his old self since the day he came back to life. "Thanks, for the effort and all that." He isn't great at these stuff. Honestly, he didn't even expect you to remember anything about him. Sure, you're his younger sibling, but he was never your older brother. He didn't do shit to deserve your time.