I didn't 'purposefully put it in a negative light.' The trope is negative. So is the one you mentioned. It negative because of the context within the stories we tell in the gaming comunity. If the aforementioned trope was rare this wouldn't be a problem.
What we gain from the brothel is a silly place that adds to the character of Thedas but it ADDS nothing essential I can think of. Where as it's place in the larger framework of the 'woman as set dressing' and 'woman as object' tropes are kind of a minus.
Why even have it in the game in the first place? What do we gain? It's silly and fun but not essential. It's fluff. No reason why Bioware can't trim the fat so to speak.
So you're rallying the troops, getting the torches lit and the pitch forks out over fluff? Overreacting, much? Do they need a disclaimer: No pixels were discriminated against in the building of this brothel.
Let's carry this out to it's logical conclusion shall we? Are you a fan of romances in the games? If so, how can you get behind a scenario that is simply the PC manipulating the NPCs into the sack? I mean, isn't it open to abuse, since people will just say what the NPC in question wants to hear so they can get laid?
We can't kill people in game either, because that's just making them into the "stereotypical badguy" trope(I have no idea if that's really a thing, but all things considered...), so that's got to go to, right?
There is no aspect of gaming that can't be singled out based on your philosophy. Even character creation can be discriminatory, right? I mean, how many people are going to go out of their way to make an ugly character, unless it's a joke, right? So now ugly people are being discriminated against, because "joke", right? It'd be really bad if there was a breast size slider too, eh? Some games actually have those.
So what would we be left with if we went after every possible instance of discrimination? Nothing. Gaming would be impossible, unless it was checkers, chess or card games. The gaming industry isn't going to be around long for that, all of those games are available on my computer's OS. Well, not sure about checkers, might have to play that online.