Yes Juan does have that attitude no doubt, but I've also noticed Ralf complaining a lot lately. What with the contract negotiations going south, and his time with BMW coming to an end soon, it also looks like he's complaining about being upstaged by a very close pass in Australia.
Here's a good in car view of montoya getting pissed, which was broadcast live on accident
http://dreinc.com/F1/Juan-Pablo.wmv