Which shows how ignorant most member in iPhone forums are. They don't want anyone to point out the shortages of the phone they use, or want it to be compared with other one. This option simply does not work as it would be censoring and last time I check, all members of MR are entitled to express their own opinion about something (be it an iPhone or Android).
Creating a new sub-forum would not stop people from posting about Android in iPhone forums. For example, would iPhone vs "enter phone name here" belong to iPhone forum or other phones forum? It includes iPhone so I see so reason why it would belong to the other phones forum. And that is just threads. How about individual posts in iPhone threads? Should those be deleted since they don't talk about iPhone?
The thing is, this exactly same situation exists in all other sub-forums too, and has existed for years. From time to time, someone posts a PC comparison to iMac, Mac Pro, MBP, MBA, etc forum. Mac vs PC is probably the most discussed topic in Mac forums. So far, there hasn't been a need for a dedicated forum for such threads, thus I don't think iPhone deserves any special treatment.