Prejudice (n.) is irrational by definition, so there is no prospect of influencing it by reasonable arguments. Against prejudice one can do nothing.
Prejudice (n.) is sometimes justified because it saves useless labour: told the earth's core is jam, we ask not about the core but about the man who said it.
Prejudice (n.) is sometimes wise and sometimes ruinous, and one can never tell which: meteorites and seashells on mountain tops were once dismissed as nonsense.
A Prejudice (n.) is not to be despised: it is the precipitate of a development that was once useful, kept alive by emotional forces.
Prejudice (n.) cannot be argued away, only outwaited: one day people simply think differently, and why they did not before remains a dark mystery.