familiarity breeds contempt

familiarity breeds contempt idiom
Long experience of someone or something can make one so aware of the faults as to be scornful. For example, Ten years at the same job and now he hates it—familiarity breeds contempt. The idea is much older, but the first recorded use of this expression was in Chaucer's Tale of Melibee (c. 1386).

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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