Try using the .filter(follow="") without .userstream() beforehand. Userstream is only the tweets from the account associated with your application. Here is a (very well-annotated) example.
If you want to get the user's tweets and filtered tweets at the same time you need to make two separate Stream() objects.
Edit: the page I linked to is now dead. The Internet Archive link should remain active indefinitely, but all the relevant information to solving the user's question is already contained within this answer. I have not copied and pasted the example from the linked page as I am not the author of it, and because it is only an example that illustrates the proper use of a Stream listener.
