Someone who has memorised the entire range of Starbucks drinks and can recite them at will.

When you eat dirt for the first time and leave your family to build a shack in the woods

People that think they know what they are talking about, enforcing those talking points and/or idea onto others, expecting all who listen to accept their words as truth, and sound like arrogant douches (or anything similar to the given definition). This person would be expected at a Starbucks as part of the stereotypical image of the kind of people one would see at a Starbucks.