BioLife Plasma Services review: Deferred for something I've previously been allowed to do.

I went to donate this morning and I got through the questionnaire and as soon as I went to scan my fingerprint the system went down. It was down for around an hour before they asked us to make a line off to the side and wait. I went out to my truck to tell my husband it would be a while. It is important to note they have allowed me to do this a couple times before. I was obviously frustrated by the look on my face, but I never got out of hand in any sort of way. So a condescending woman tells me since I went outside unescorted I'm being deferred after being there for so long. So if that's your policy how come you've let me before? Why is it only policy when it's convenient?