Why doesn't he know anything about Python or Ruby warts? I think his complaint about Python is valid. The other wart I would add is Python having a default empty list in a method signature. In successive calls to the function if you modify the list it retains it's value. (The solution is to have it set to None in the method signature). Read
http://docs.python.org/3/tutorial/controlflow.html#function-... section 4.7.1 if you're curious
Generally though I'd say Perl has hundreds (or maybe thousands) of warts for every one Python or Ruby has.