Sounds like you were injured by your gym. A gym may be liable for causing "hurt feelings". Don't let them get away with this. It's obviously just a pretext to discriminate against (pick one or two) blacks, gays, latinos, asians, jews, muslims, indians, obese, disabled, female, old, or ugly. All claims would be actionable. File a complaint with the EEOC, the BBB, Consumer Affairs, and the Division of Human Rights. That'll teach em.
Special "Protected Class" Ed