In Gulliver's Travels, what in the king of Brobdingnag's criticism makes you think that Swift was satirizing his own society?

Gulliver thinks that
the king of Brobdingnag is pretty simple; he does not really understand the way the world works.
 Gulliver says, 

[The king] wondered to hear me talk of
such chargeable and extensive Wars; that, certainly we must be a quarrelsome People, or live
among very bad Neighbours [....].  Above all, he was amazed to hear me talk of a mercenary
standing Army in the Midst of Peace, and among a free People.  He said, if we were governed by
our own Consent in the Persons of our Representatives, he could not imagine of whom we were
afraid, or against whom...