Most manipulators only approach people they know would never say no because of their nice warm nature.
Not everyone is out to take advantage of you, but manipulators ordinarily will get people to do things for them for something they should ordinarily pay for.
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Friendship with manipulators is toxic because you constantly pushed into a situations you can't seem to work yourself out from.
In a case like this, it's advisable to cut loose such people from your life. Putting up with them will cause you more good than harm because they are aware of their manipulative nature but will never do a thing to change it.
READ: How to persuade a friend to leave their unhealthy relationship
In reverse situations when you are in dire need of help, these people are most likely not to lift a finger to help you and even if they do, they'll expect something bigger from you in return. You need to know when to walk away from such people.
Watch video by Marie Dubuque as she explains how to deal with manipulators.