Yes,I think so.In fact ,prejudices comes from two different aspects,in my opinion,intentionally or unintentionally.
Some people put prejudices on some things unintentionally,because actually they don't know about them clearly,and then they just judge them by some thoughts in their mind while not on the basis of true facts for their knowledge is limited.
While some others hold prejudices intentionally because they might stands in different groups,and which leads them blind their eyes in front of the truths.As a result,they do not hear what the minds speak.
Both of the two happen a lot in the world,in the past and nowadays.Because there are prejudices in the world,we need to learn more and be cautious when we make judges to avoid more prejudices.