Final answer:
The phrase from the question encapsulates the sense of undeserved differential treatment, highlighted in the provided excerpt by a moment of exclusion faced by the protagonist due to societal prejudices.
Step-by-step explanation:
The phrase 'something you somehow haven't to deserve' seems to suggest a concept or experience where one receives or endures something without having earned it, often with a negative connotation. This idea is reflected in the excerpt where the protagonist realizes they are treated differently because of inherent characteristics, despite their capabilities and achievements.
The refusal of a visiting-card by a classmate signifies a moment of exclusion that defines the protagonist's realization of being an 'other' in society. As he grows up, the protagonist wrestles with the idea of earning respect and opportunities that seemed to be the birthright of others – not through entitlement, but by exceptional personal efforts in education, athletics, or ambition.
This feeling of undeserved treatment aligns with concepts of prejudice, discrimination, and social injustice. It paints a picture of a struggle for equality and recognition where the barrier is not the lack of merit but an impenetrable social veil that distinguishes between individuals based on race or other arbitrary characteristics.