Well...I stole this line from my buddy Craig T....but I like to bolt back at them with a bit of attitude: "No, it's NOT a Tahoe....it's a Yukon!!!!!"
My responses vary...depends on who's talking and what they are trying to achieve in asking that kind of question.
If they are serious and non-offensively inquiring, I usually start listing off all the differences. You know, confuse them with facts.
If they are being wise-asses, I generally give them the above mentioned Yukon line...but then follow it up with something about "If you think the H2 is just a dressed-up Tahoe, you'd probably also figure Albert Einstein is just a dressed-up monkey who could stand erect and talk".
Or I tell them about my buddy who has both an H2 and a Tahoe and finds them dramatically different.
Oh yeah...another one is..."there are two kinds of people in this world, those who can afford and have H2's...and those who can't and desperately need to find a way to knock what they can't have. Seems you've got yourself a good excuse!"'
Who knows...saying something like that to me is like spinning a huge wheel of sarcasm...you never know what kind of crap is bound to come flyin' back at ya...
Last time I checked, my ass was BAD.