What is accepted as a criteria of truth in one time is not in another time. What is viewed as overwhelming evidence in one time is seen as insignificant in another. Still, there is objective truth. We just may not see it. As a sociologist, I look at the influence of culture on our lives.
Sociologist are also the product of cultural conditioning as people and as sociologists.
The graduate school that you attend has a certain type of approach, schools are not random, nor are their effects, they are self-perpetuating, new selected by old members, cultural continuity, linking Conform to standards of group to remain a member in good standing in the group. Conform to get promoted, published, appointed, continued in career. Not a sinister social control but maybe selfish. If do not conform, may be forced to some obscure college. Fact, now of the theories of prejudice find the cause of prejudice in the minority itself.