Yes, the given statement "sociologists are concerned with the reactions of people to certain physical characteristics and how these reactions affect individuals in society" is true.
Sociologists study people's responses to certain physical characteristics and their affects on individuals of the society because they believe that understanding these responses can help them explaining social behaviors that lead to the events of segregation and discrimination, such as racism etc.
Recognizing at what age the responses to physical traits start becoming negative, can help them to understand the external factors that contribute to these learned behaviors and even help to change them.
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