Your second sentence stating that the pressure would help one to open the door leads me to believe that you do not know how the doors operate. I have almost 21,000 hours logged, almost all in pressurized airliners. I do know how the doors operate.
Well, goody for you, but I don't see how that's remotely relevant.
I still say that it's not a far stretch for an average Joe to think of the pressure on the inside pushing out, and if you are trying to DEBUNK something, you need to do more than just say "it's pressurized".