Toxic relationships are possible, it takes a strong individual, not a weak person who can't speak up on fairness. Don't take offense that's just how it is, unable to stand up for ones self in situations is a problem in of itself. Set up boundaries and don't let that person cross them. They do, tell them straight. Most people don't know they are toxic, till someone finally has the balls to say something and be effective. Be respectful of course if you want a person to take you seriously, and if you're that good of a friend they realize quick, 'I better knock if off, I don't want to lose this cool person.' And if after that the person still doesn't get it after several times, cut em off.