It happens occasionally to me too, although I'm Caucasian on a EU passport with valid E-2 visa status travelling in and out frequently for most of my adult life.

My last time about 4 weeks ago was similarly horrific - arriving in ATL and having seemingly just bad luck with the first Immigration Officer (who was AA).

Ended up for absolutely nothing (error by first IO in "reading his screen" ) in the 2nd Security Check - exactly as you described complete with one single screaming and intimidating officer in charge and no phone calls allowed - it reminded me very much of movie scenes from WW2.

After approx 3½ hours of waiting in this holding pen it was discovered - with one single look at the screen - that I was held for no reason at all and was promptly stamped and released without any apology or remark.

The whole ordeal had taken approx 6 hours and of course made me miss the last flight of that day to my final destination - home.
Had to sleep at the airport - with my loved ones extremely worried and waiting at the other end.


They really make you feel very welcome - don't they ?

My Advise: pick your point-of-entry carefully and observe diligently during the long queue-times which IO looks the most "welcoming" in his handling of foreigners and - with all due respect - never ever respond with disparaging remarks ..

Don't get me going about these two wonderful "welcome mats" ..

Last "warm welcome" experience @ YVR in March took about 6 hours - and with an equally "warm" farewell advise to consult only the very best Immigration Lawyer - passport was stamped and of course consequently missed last flight to PDX ...