I do wish to note that, when I wrote the comment to which you reply, I hadn't yet read far enough into the thread to encounter the many people saying "Oh, you just have to power through the first {100,300,...} pages, and then it gets amazing!" Such claims for Infinite Jest are new to me, and it's an argument to which I'm not without sympathy; I'm forced to consider the possibility that I've judged the book too harshly, and that this may be a case where I'd be well served to suspend the usual criteria by which I decide that an author is wasting my time.
(And I have to say, that cruise review piece you linked is doing a good job winning me over, too. Thanks for that!)
But so anyways, by all means write exactly as you feel like writing. I'm a huge fan of DFW, for example, precisely because he is all fancy and colloquial at the same time, which happens to tickle my fancy quite a bunch. I just wanted to point it out.
Either you don't give a shit about 'them' and write as pretentiously as you desire, or, like myself, you adjust your style to distance yourself from 'them' because you dislike the association.
As it is, it's rather confusing to me because I can't tell the difference between you and the 'Eng lit academia' you seem to wish to avoid.
All that said: I don't think you write like a pretentious ass and I feel anyone should communicate however they want as long as the message comes across. And personally I like your style. So rock on, I guess :). But it's essentially what DFW is doing too, I think.