Normal for derailleur to make noises?
Is the question is it normal for a it to make noise when cross-chaining from smallest to smallest which you're not suppose to do?  Yes, but by doing so you are putting more stress on the chain and cogs, it is bad for your drive train and can result in dropping a chain or mucking up your gears faster than normal.

It is likely making noise because it is rubber or grinding on the derailleur or chain set.

The bike was not made to do that, you said yourself that you know you are not suppose to do it. 

"My car sounds like crap when i run it with zero oil in the engine.. is this normal?"