I’ve known several guys who did this. Not that weird, it’s been sold to me as a less clean up alternative to doing it in say a sock or something.
I mean, yes, I have jerked off into a condom multiple times, like 3- 4 times in my life. I also think there’s a chance he is lying. Just keep your eyes open for the red flags.
My friend claims he saw a dude jacking off in a condom in his dorm shower