Whenever we meet new people, we have a habit of finding out their languages, their caste, from where/which place they came, and whether they have children or not, and even the level of their richness or source of their subsistence, and so on...
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Unless and until we get some plausible answers and facts, we would not be, perhaps, comfortable with them.
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It is in our nature to establish some fixation coordinates with them to feel more secure and develop an internal model of them, and we carry this conceptual model in our mind via which we interact with them in future.
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In most cases the model gets updated, and so on...
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