The Brobdingnagians are very simplistic people and similarily to the Laputans before them the Brobdingnagians are distinguishable from Europeans by their size. The Brobdingnagians are immense and everything in their country matches their size. Grass grows 20 feet high, little girls (Glumdalclitch) can reach 40 feet and hedges can approach 120 feet high. A fully grown adult Brobdingnagian easily takes 10 yards a stride. The smallest known adult in Brobdingnag is the Queen's Dwarf who himself is nearly 30 feet high.
The Brobdingnagians have distinct classes as well as we see Gulliver being passed through them all as he is shown to all of Brobdingnag by the farmer, at a price. The farmer nearly kills Gulliver by making him performe for hours on end without rest or food. Unlike the Lilliputians the Brobdingnagians are not so cruel but more simpleminded. The farmer was so intent on making lots of money off of Gulliver that he didn't even realize he was killing him.
When Gulliver is 'sold' to the Queen we see another class of the Brobdingnagians. Gulliver displays his fawning love that he always does for Royalty by kissing the end of the Queen's pinky finger. Gulliver once said she possessed 'infinite wit and humour.
The Brobdingnagians and their immense size are meant to symbolize the private, personal, and physical side of humans when examined up close and in great detail. In the Philosophical era of Enlightenment the mundane daily routines were overlooked along with other minute details which were amplified for Gulliver and could mean life or death. A European philosopher could ignore that fly buzzing at his ear but when the fly is bigger than you, you get a different perspective on life. In other lands it is...