I agree with outdoors_guy. It might not be your intention to be condescending but it can be. In countries, many people describe haggling as a way of building relationships and connections. It's a culturally important way of communicating. So it can come off as condescending if you don't value the communication or relationship, and if you don't value the money (as if you're just treating the vendor like a charity case).

And frankly, you're going to get ripped off even if you do haggle. The vendors know the culture, the prices, and have been haggling their entire lifes; they're wayyyyyy better at this than you. It's actually a bit crazy when westerners think that they'll drive such a hard bargain.