Keep running.Don't stop and start screaming back at the heckler or flip him off. Although it may be tough to ignore him, it's better to keep your distance and continue moving.
Don't appear vulnerable.When someone starts hurling derogatory comments at you, hold your head high and stay strong. If your harasser tries to stop you, be forceful. Tell him to back off and keep moving.
Run with a cell phone.It's always smart to carry a phone with you, especially when running alone. If someone is verbally harassing you and you feel threatened, call the police. Give them a description of the harasser and where and when it happened.
Keep your run safe.This may seem like a no-brainer, but don't run in isolated areas, deserted streets, or overgrown trails. Never run by yourself at night.
More: Safety Tips for Running