'Manipulative' or 'toxic' are single world thought terminating cliches. They're something you call someone when you can't be bothered thinking about their problems any more, or dealing with their issues any more and you want to write them off in a way that will make other people suspicious of them.

As someone more on the staggeringly blunt end of the spectrum, I get different words thrown at me when people want to stop dealing with an issue at hand, but it's the same thing.

Those terms tell you more about the person using them than you. (Assuming, of course, you haven't been engaging in a Machivellian plot to undermine Western civilization or some such thing.)