The most irritating part about the pat down, well, apart from having some strange bloke estimate where your privates hang down to through your trousers, is having to keep your arms out for the duration of the festivities. Its definitely uncomfortable and may make one feel like they have no control over the process. IMO, the best way to avoid having to keep one's arms up is to tell the TSO up front that, due to a chronic condition, one is unable keep arms extended. It has been my experience that I have been allowed to keep my arms by my side as a result of this declaration. However, on both occasions that I have made this declaration, I have been asked what condition I have, to which I have replied that I am not comfortable sharing my private medical history with anyone. A supervisor has had to clear the TSO to perform the modified pat down and this has not presented any problems.