For some, being disagreeable is the greatest pain known to man. Non-confrontational folks are so debilitated by their desire to make everything run smoothly that they sabotage their own opinions for the sake of avoiding an argument. Don't be misled though, that doesn't mean that non-confrontational people aren't opinionated– we still get fired up about things! However, the only ones who ever get a piece of our minds are the shampoo and conditioner bottles sitting on the shelf in the shower, because, as everyone knows, that's the best place for people pleasers to get their punches in (in their heads of course).
Are some anti-fighters introverted? Absolutely. Here's some introvert memes for the stay at home peeps who will never get in an argument because they refuse to even interact with other humans.