Sorry to hear about the damage to your heirloom cymbal.
You didn't ask for advice, just commiseration, so apologies if I'm out of line.
I am not a parent, but I used to be a teenager (which I guess these days, 22 is maybe the new 16), and here's what would have worked best with me:
Right now you are rightfully angry with him (and as you say, with yourself for putting your cherished cymbal at risk). Let that simmer down before you proceed. He seems to be reacting to your anger with a display of apathy.
As I said, "display." Unless he's a complete sociopath, there is shame in there and he's covering it up.
The approach that would have had the most impact with me would be to express your sadness at having had your prized heirloom damaged.
Focus on expressing your feelings, not his irresponsibility. If you rail on him about the irresponsibility, his defenses will go up and he'll push back with his passive act. It's better to emphasize the consequences of his irresponsibility. "You did this and it hurt me."
"I was happy that you took an interest in playing my acoustic set, and then when I got home and saw it in that condition, I was really angry. And when I saw the crack in grandpa's cymbal, I was sad, I felt sick. That cymbal means a lot to me and now it will never be the same."
He may not respond to that right away, but it will cut to the bone (in a good way). It may take years, but the lesson (and your reaction to it) will stick with him.
It's hard at this point to think about showing vulnerability, but if you can manage it, it's a good thing for him to learn how to do himself. You showed it to us, a bunch of strangers, so you can do it.
Then you can say that if he wants to help make it up to you, he can buy you a new snare head and sticks, and either help you stop drill the crack or pay to have the crack cut out by a pro. Rather than demanding, suggest that he do these things if he wants to. Then rather than the parent/punishment thing, he decides if he wants to man up or not. You are both grown men, after all, and if a friend sat down at your kit and accidentally did these things, you wouldn't demand recompense. Treat him like the man he should be, and let him do the rest. He may surprise you.
I favor cleanly cutting the crack out, as IME, it looks better and does a better job of stopping further cracking. And the chunk out of it will serve as a reminder to him.
You're teaching him the lesson that when you mess up, the thing to do is make whatever amends you can and move on.
AND, after you settle down, show him how to hit a crash with a glancing blow and not hit through the freaking cymbal. AND, tell him how you can hit an electronic kit as hard as you want, but NOT an acoustic kit.
That's more likely how he cracked a cymbal that's been played for 50 years with no incident: the cymbal wasn't flawed, he just hit it wrong.