Eliminating all traces of racism out of a sense of political correctness only serves to make the problem invisible. It doesn't address the underlying causes that lead to the intolerance and stereotypes in the first place. Just because you can no longer see racism, doesn't mean that it vanishes....
I would agree, and say that this goes beyond issues of racism.
For example, I recently participated in a musical that, in the script, depicted a character named 'David' who dressed as an angel for the church Nativity pageant. He was bullied for this, beaten up and his costume damaged, by the town bully, who repeatedly called him 'fairy'. Now this is pretty clearly homophobic, and the director identified it as such. However, the solution -- renaming the character from 'David' to 'Daisy' -- arguably created a bigger problem than it solved, because the reaction of the other characters to 'David's' plight, chiding the poor boy for not standing up for himself and dismissing his injuries as 'boys will be boys', becomes entirely inappropriate when the character being beaten up is now 'Daisy'. The characters now seem entirely heartless and insensitive to violence against a young woman in a way that's almost ridiculously unrealistic.
I can certainly appreciate Shawn's response here -- he's right that when an author decides to tackle sensitive material, he (or she) has a responsibility to that material and to the audience. But reading the adventure as a whole, it's pretty clear that Shawn's intent here was not to portray the Gur in the adventure as stereotypical 'thieving gypsies'; it was, as he notes, to contrast the townsfolks' stereotypical response with what the party might think later once the Gurs' true motivations were revealed.
Someone who wants to criticize a work also needs to take on a certain responsibility toward that work; namely, to critique the work as it exists, not as the critic assumes it is in order to validate a worldview or make a political point. I don't feel that the OP took that responsibility seriously here, and so I feel no particular responsibility to take that person's opinion seriously.
Warfteiner's response is also welcome -- more guidance for DMs, particularly inexperienced DMs such as those who might be tempted by this season's DM Rewards to try a turn behind the screen, is always welcome -- but based on the response to this and to the Inclusiveness thread elsewhere, I'm fairly convinced that our community (at least the portion of it that frequents this corner of the Internet) is already pretty well-aware of these issues and isn't going to blow them off or throw them under the rug.
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Pauper