That seems a little silly. What do they care what language you're doing the game in? Seems like they're getting their noses in places they don't belong. It isn't like you're critiquing their choices of art programs (right?).
You wouldn't believe how arrogant some people actually are. For example, check out the TrueVision3D forums. They consider anything not written using C#,C++,Delphi,VB....etc "unprofessional toys" and the people who uses them are "stupid". Hell, even the Torque3d engine is considered a joke to them. Ironically, I have yet to see anything professional comming out of TV3D and not a single game or app written using it was even sold (to my current knowlege)...yet it's considered "professional" cause it requires a "professional" language to use it.
Good thing too, cause I nearly shelled out $150 for nothing...glad I saved $70 and spent it well on BlitzMax.