I hear #9 a lot - Java programmers are thought of by management as a raw ingredient, like concrete, that can be ordered up and poured into a project. Python can be used effectively by anyone who really understands computers and software, but that understanding is less common, and the practitioners are more idiosyncratic.

edit for correctness.

Unfortunately, unequivocally, yes, there is so much misinformation. I definitely would not have spent so much time on citations, otherwise ;)

I'm not even a python developer and I know most of these are completely untrue.

Well, sure you are not a python developer... most untrue? Which ones? Why?

Tragically, yes. I've been in meetings where each of these is brought up as a concern of using Python over a more traditional language like C++ or Java.

This is kind of like debating with creationists -- yes, it is absurd and dumb that the discussion even needs to be had, but they must be challenged.