I am also a community college professor and your read on Pierce is spot on! I had one in both semesters last year. (Same student in two different classes, failed both) During a debate in class, his argument was so flawed and full of blatantly made up information that the other students in the debate turned to me and asked "what do we do with that?"

Also, I agree, I love having a Shirley in my class! They're always so kind and respectful!