He is not well-bred, that cannot bear Ill-Breeding in others.

Benjamin Franklin (1706–1790) American statesman, scientist, philosopher, aphorist

Poor Richard Improved (1748 ed.)
    (Source)

This is sometimes noted as a restatement of a phrase in the introduction to Thomas Fuller's Gnomologia, (1732), but that reference to "well-bred People" doesn't seem to match the sentiment here at all.