He didn't seem rude to me. He asked a question and then suggested an alternative. And it was a legitimate question. The OP stated he wanted to create a ROM the same as IOS7 in ALL aspects (his emphasis). It really does beg the question why not just get an iPhone in the first place. I'm not trying to be an ass, I just don't get it.
I understand your point of view toward their reactions, but if it was the first time that someone gives that type of answers to a new-comming OP, it would be more acceptable. However, whenever someone comes with the idea of porting or creating a OEM Rom to the affordable and very open source Nexus 5, there you will find a anti-development crew suggesting to buy a much more expensive device as a solution. Why not tell them the reasons of why it's difficult to port a Rom or where to look for help, instead of telling to spend their school money?
I could be wrong, but I ts not so welcoming for them.