I don't see how he would be able to pass the bar to become a lawyer
Some of the PHDs in my office think "U" is the correct spelling of "you."
Basically impossible
.
On another note, I'm not sure what to think about that kind of 'slang'. On maybe a less conscious level, it can make a person look stupid/illiterate/uneducated/lazy, especially if it is used in a formal setting (e.g. imagine a physician's report referring to you as 'u'). On the other hand, does it really matter as long as the meaning is clear? 'u' is more efficient than 'you', and the meaning is obvious.
So I guess I object to it on obsessive grounds (which is what I usually go with
), and I'm okay with it from a rational perspective.