Perhaps you should concentrate more on your game than on something this unimportant, crash. MI will have to check IPs, but considering he called you bull, I'd say he's an oldschooler, coming back after a period of inactivity (at least, I don't recall anyone calling himself deviant on WA, but I could be wrong, of course).
If this is his only TUS name while he used to have another name a couple of years ago, it's really up to him whether he tells you his old name or not.
In the meantime, perhaps you should try to be more polite (or basically polite at all) before you too are the happy owner of the scorn of beer and nino.