From my knowledge, the answer to this question is a 'manipulator'. Hopefully that helps with an answer.
Uggghh..I've been looking for this as well...The only word I can think of is blackmailer...
I would like to propose that a new word is used for such an act. I would like to give the word 'exploitationist' for such a thing as using others or things to the advantage of themselves.
Someone who uses a compass is typically called an orienteer or navigator.
When someone uses their voice to communicate words instead of singing them, it is called speaking.
When someone does this they Pantomime.
a sesquipedalian
An exploiter would be one who uses advantages and/or people for personal gain
Hacker
There is no special term for a person who uses any of the products offered by the Xerox Corporation. Sometimes people whose job it to manage and maintain a xerographic copier is called an "operator."
Someone who buys and uses products is called a consumer. And, one that particularly consumes health products is sometimes referred to as a health nut.
artificial respiration.
Someone who uses their education level to snub people.
Such an attitude is called homophobia. Even though the phrase uses the word phobia (Fear) someone who is homophobic may instead hate or dislike LGBT people.
Pantomime