Gaboso
It’s when you pick one thing someone did and say the whole group is that way. Like you saw one person be loud and now you think the whole class is a bunch of loud mouth jerks.
My teacher saw one kid talk too much and now she thinks the whole class is a bunch of chatterboxes.
I saw one person wear mismatched socks and now I think the whole school is a disaster.
My dad saw one guy eat a whole pie and now he thinks the whole family is greedy.