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"What'd you do?" I said. "Give her the time in Ed Banky's goddam car?" My voice was shaking something awful.
The next part I don't remember so hot. All I know is I got up from the bed, like I was going down to the can or something, and then I tried to sock him, with all my might, right smack in the toothbrush, so it would split his goddam throat open. […] It probably would've hurt him a lot, but I did it with my right hand, and I can't make a good fist with that hand. On account of that injury I told you about." (6.32-36)
It’s a little anti-social to flip out on a guy like Holden does to Stradlater, just because you suspect him of sleeping with a girl you like—but it’s not unheard of, or anything. The troubling part is that Holden doesn’t “remember so hot.”