Discrimination doesn't have to be big or obvious to hurt; even one thoughtless word or exclusive action sting. This fear becomes a escalated problem for characters when, in an effort to avoid discrimination at all costs, they hide or change who they are, thereby limiting themselves and living short of their full potential.

The character associating mainly with people like them (same race, gender, class, etc.)
Choosing to remain in background (at work, in social situations) to avoid drawing the wrong sort of attention
Choosing a job where discrimination will be minimal rather than following a dream
Changing their appearance or doing certain things to be accepted, even if it doesn't feel right
Painstakingly trying to be ‘perfect' to avoid being targeted (at work, social functions, etc.)
Avoiding “charged” events where the discriminatory factor is front and center (rallies, meetings, gatherings, etc.)
Pretending to not hear rude jokes or comments to keep the situation from escalating 
Becoming adept at hiding indignation, anger, and rage
Avoiding certain neighborhoods or places
Keeping silent when witnessing discrimination
Going to great lengths to work with and surround themselves with people who are "safe" or like-minded
The character raising their children in a bubble, sheltering them
Hesitating to open up about the parts of their life that may invite discrimination (mental health conditions, sexual orientation, etc.)
Coaching their children to not draw attention, speak out, or dress or act a certain way that they deem unsafe