I'm surprised you lasted that long -- there is no reason for anyone to scream at anyone unless they do something incredibly dangerous or careless; you only do this so they understand the severity of their action. For example smoking next to flammable materials, improperly handling chemicals, etc...
one day he told me I shouldn't leave windows (on the computer, not physical windows) open when I go home at the evenings because it looks like I left work in the middle of doing something.
After that I made sure I minimized all the windows before leaving.
