A manipulator will always try to shame you, blame anything to make you feel guilty. If during the conversation you feel such attitude, pressure from the opponent, it is not necessary to succumb to his influence. You must strictly adhere to his point of view, to stand by his opinion no matter what.
There is also a type of manipulators who love to put pressure on the pity, trying thus, for example, to throw on you their job. In no case do not succumb to provocations. You must make it clear to the person that you have your own business, and you do not intend to perform another's duties. Otherwise, such a person will always be you to use.
The manipulator may try to cause you to have aggression. In no case do not succumb to provocations. Always speak calmly, no matter how he tried to provoke a conflict. In the future try to communicate less with this person.
Manipulator is constantly confusing. For example, it happens you to discuss one question, and he immediately jumps to another topic of conversation. As a result, you are unable to gather my thoughts and do not remember what he was talking about. Here we need to remind people about what was going on, and ask not to be confused, first discuss one thing and then move on to another.