That’s the punch line of another joke but it applies directly in this quote from (of all people) Garrison Keillor:

Liberals like Curt were kind and loving to strangers, at least theoretically, and full of warm feeling for abstract entities such as The Poor and The Oppressed and The Minority, but liberals are hard as nails on their loved ones, preaching at them and holding them to impossible standards, perpetually shocked and disappointed by the flawed humanity of their flesh and blood. Liberals love a crowd, from a distance, and they treat their families like —-.

HT: Douglas Wilson, Credenda/Agenda