(a) A recipient shall not discriminate against any individual because that individual has opposed any act or practice made unlawful by this part, or because that individual made a charge, testified, assisted, or participated in any manner in an investigation, proceeding, or hearing under section 504 or this part.

(b) A recipient shall not coerce, intimidate, threaten, or interfere with any individual in the exercise or enjoyment of, or on account of their having exercised or enjoyed, or on account of their having aided or encouraged any other individual in the exercise or enjoyment of any right granted or protected by section 504 or this part.