It's unfair to use your public school costs as evidence because they are not comparable to his numbers. Here are the numbers across the board for all college students [1]:
Median: $9K
Mean: $26K
Also, if we were to put opportunity cost into the calculations (because you could work/work more if not going to school), it would quickly approach the $25K figure.
[1]http://www.collegeboard.com/student/pay/add-it-up/4494.html