wtf?!

Today at 4pm I attempted to use the restroom facilities at Pioneer Courthouse Square in Portland Oregon, I was denied access to the stall I attempted to use by security. I was told that it was specifically for; "handicap persons" even though the sign on the door stated; "All-Users". I was then kickout of the facilities for questioning the guards reasoning. I informed the front desk who gave me a card and went in to get the guards name, a Caucasian man entered the stall I had been band from. This man wasn't not handicapped and was not harassed by the guard in anyway, I inquired; "why didn't you say anything to him?" and received a condescending smile. I am what you would call African American, I am also disabled and felt no need to reveal that information to use a public restroom designated "ALL-USER". What happened to humanity?!