Most Helpful Girl
You can't really prevent others actions, if that's who they are. Try dating a person that doesn't have any sort of reputation. Don't try to be something you aren't. If you are a good guy, there might be some women that see that and will try to manipulate you. Stay who you are, and I hope a good woman will notice.
I can't speak for others, but I dislike bad boys. They aren't my style. I like to live a happy, fun life. Bad boys are stressful, no trust, and makes me uninterested. That's just me, tho.