I hadn't heard that, but I did see an interview with the actor who played Rom who mentioned that the Ferengi actors felt isolated from the rest of the cast and that Armin did have some strong feelings about that.I heard (but have not seen direct examples) of Armin Shimmerman having to have some... delicate conversations about being a Jewish actor playing a greedy alien.
So it wouldn't surprise me that there's more to the story.