the.com/stereotype

means A fixed, oversimplified idea about a group of people that gets applied to individuals regardless of whether it fits.

from Coined in the late 1700s in the printing trade: a 'stereotype' was a solid metal plate cast from a mold of set type, used to print the same page over and over without resetting it (from Greek 'stereos,' solid, plus 'type'). The word moved into the mind in the early 20th century, when writer Walter Lippmann borrowed it to describe the fixed, pre-cast 'plates' of judgment people use to print the same image onto every member of a group — convenient for the printer, lousy for the truth.