When your boarding pass was printed, did it have a seat number assigned? Sometimes, AA oversells and you can get a boarding pass but no seat. Did you have a confirmed seat because without one your complaint may fall flat.
If you did have a confirmed seat, it's possible that they requested volunteers first before they decided to involuntarily bump you. If you only made it to the gate 25 min before the flight it's possible you missed that announcement. But after they decided to bump you, if you became belligerent with them and started screaming or complaining, they can actually just deny you boarding without any compensation because they can claim that you are "unfit" for travel (The Passenger Rules of Carriage is an interesting document). However, if you remained calm and you actually had a confirmed seat (a seat number needs to be on the boarding pass, without one you never had a seat on the plane to begin with, so in which case they never denied you anything. AA has interesting rules with ticketing people.), then you are entitled to nice compensation.
There are a lot of possible reasons for why you were denied boarding, but I would say anti-semitism isn't one of them. I would first inquire for the reasoning before pointing that finger at them and accusing them of anti-Semitism.