I get the feeling that reducing all of society into 3 groups, and thinking all 3 groups are the same, and thinking that because you believe X, all of your group

I get the feeling that reducing all of society into 3 groups, and thinking all 3 groups are the same, and thinking that because you believe X, all of your group believe X is rather foolish. It's what a lot of people do, e.g. some rightwing dumbass dies, someone celebrates, and another rightwing dumbass sees a few peoplecelebrating, maybe they can see these people are left/maybe they assume, and they conclude "See, the left are celebrating, they're all evil!".