What can you do yourself?
As mentioned earlier, a distinction can be made between conscious and unconscious discrimination. Both can be hurtful, but they often require different approaches. If you believe the person is discriminating unconsciously, try addressing them about their behaviour. People are often unaware that their actions can deeply hurt others. It may take courage, but it can be a first step towards ending the discrimination.
If, as a victim, you believe the discrimination is intentional, it may be wise to talk about it with someone you trust. This could be a colleague, someone from your private circle, or your manager. You may also choose to report this inappropriate behaviour. This can be done with the police (discrimination is punishable by law) or with an independent organisation that can investigate the situation.