How do you define "reason to suspect"? E.g. what separates the actions that would result from your position from the actions that would result from a position o

How do you define "reason to suspect"? E.g. what separates the actions that would result from your position from the actions that would result from a position of "there's nothing wrong with racism as long as it's not said aloud"? Established behavioral patterns? Less than that? More?