A word to describe dislike caused by not knowing a person
Thanks to: Ram Pillai
Bias
unreasonably hostile feelings or opinions about a social group; prejudice.
Source: dictionary.com
Some examples:
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There are tons of online disputes as to Wikipedia's reliability, accuracy, and lack of bias.
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Reporters must be impartial and not show political bias.
Or:
Preconceived notion
noun – An opinion formed beforehand without adequate evidence.
Source: thesaurus
Some examples:
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her perception of him was dwarfed because of her own preconceived notion of him.
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she had a bad impression of him based on a preconceived notion