You cannot avoid the scanner. It is against the law to go through another form of screening for 24 hrs if you have refused to be scanned. You can change your mind and undergo body scanning at any time.
If this is the same incident I am aware of, it was one very nervous and then relieved SO that was advised he could and then did undergo scanning after initial refusal so that he could join his crew and avoid delaying the flight. There was no bravado in the instance I saw.
Irrespective of the rights or wrongs of it all (and I have been accused of being pro all of it, which I am not) the fact is it is now the law. If you break it or refuse to conform to it, be prepared for the consequences.