familiarity breeds contempt

idiomatic

1. extensive knowledge of or close association with someone or something leads to a loss of respect for them or it.

Issue is it seems negative.

If someone or something is good then familiarity can lead to more respect for it.

So we can say that familiarity breeds contempt if the observing person has a negative view towards life and is always looking for the bad in things.

Those who look for the good shall find good in everything also.

There is good and bad in all things.