I am really confused about what kind of scar would cause others to treat you poorly... Are you thinking it's location/shape makes it look like a fighting scar? Or that people are just being rude b/c of a prejudice against imperfections? In other words, tell us more, please.
I have chicken pox scars on my face that feel very prominent to me but whenever discussing them is relevant (if I am talking to a close friend, a therapist, etc) almost always the reaction is "I didn't even notice them."
Concealer can be a godsend and is totally not just for the ladies!
Sometimes I use face powder to cover the scars and sometimes I don't. As long as I stand up straight and make eye contact there are very few physical imperfections that can't be overcome.
I just can't imagine being nasty to someone over a scar unless, perhaps, maybe, the scar made me fear that the person wearing it was an extremely violent person. And I'm having a hard time thinking of what kind of scar would make me think that. I mean, the person would need to be waving a broken beer bottle towards me for me to get that thought in my head as best I can imagine right now.
At the end of the day you have to do what makes you most comfortable in your skin. But maybe if you tell us a bit more we can provide even better advice. This is a very resourceful community.