Mostly because the Roman empire was a hugely vast empire in time where the internet or any other form of fast communication possibilities didn't exist yet. For this reason, it would be highly unpractical for Rome to rely on having direct democracy and each person giving his vote on every aspect of life.
Answer:
Stereotypes influence how we think about other people. Stereotypes direct our attention toward some things and away from others, affecting what we notice, and what we remember later on.
