Don't worry about it. There will always be people wanting to argue, no matter what the post/thread is about. Heck, I know I have fallen into that same trap as well.
In any case, you do not need to purchase anything. Borrow the book! It is a good read and motivating. In our case, the lowest item to pay off first happened to also be our highest interest rate. Even if it hadn't, I still would have chosen the lowest item. It's a great feeling watching the balance get lower & lower and knowing there's just 1 more month left.
A PP mentioned "GET MAD"!

Yes, get mad and get angry! Our Visa has had that $6,300 balance for 3 years. Always making nothing more than the minimum payment. While I was reading "Total Money Makeover", my mom happened to mention (strongly) that she felt we should put our Disney money toward paying off the Visa and taking our trip in a year or two. I tell you, that scared the heck out of me!

I was afraid she would do the mother thing, and refuse to look after our kids in our best financial interest.

With my grandparents declining health and my mom's health, there's no way a kid-free trip would happen after this year. Fear and anger make good motivators!
It's amazing how many things you can really do without when determined. In 4 months, we still made all our mtg, car, insurance, food, utilities, etc. payments. Plus purchased our airline tickets, all-season tires, kids' monthly tutoring, swimming lessons, soccer lessons, kitten shots & spaying bills - all adding up to about $3,200. Plus was able to pay down $4,900 on the Visa.
The hardest part for the kids was learning Mommy & Daddy are NOT going to buy them something small when we are in the store, and no we are NOT having fast food for dinner tonight!