It is difficult to respond to personal insults.
It wasn’t a personal insult. It was a statement of fact addressed to birthers. The US Supreme Court spent pages in a 1898 decision detailing their belief that the phrase natural born citizen came from the strictly analogous common law phrase ‘natural born subject’. That in turn meant it applied to those born of alien parents, provided they were here with the approval of the government.
http://www.law.cornell.edu/supct/html/historics/USSC_CR_0169_0649_ZO.html