Here are some actions that might help you in this situation:

- Tell him explicitely to stop immitating you and that it hurts you.

- If he still doesn‘t stop, your company might have a human resources team which you can consult, whose job it is to resolve conflicts.

- If your company does not have such a team, you can talk to your boss. He is required to resolve conflicts between workers and consulting him should not put your job at risk.

- If these steps dont help, you might want to consider searching a new job.

Keep in mind that you should still treat everyone with respect, even if they dont treat you with respect.
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