Some people just have the mindset of "all debt bad!", without considering that some people make different choices. My personal favorite is, "always pay off your mortgage as fast as possible!" There's absolutely nothing wrong with having that goal...but, some of us have a really low interest rate, and can make more in the stock market, rather than selling off stuff to pay off the mortgage. That doesn't make others wrong on mortgages (or not wanting to pay any interest, ever), it just means that I've considered the options and do what's right FOR ME. Just like you do what's right FOR YOU.
There are plenty of other money decisions that are not one size fits all. Another of my favorites is "nobody has a pension anymore!" Um, yeah, they may be rarer, but some people have them. I can also see the case for some student loans (depending on circumstances and major), or even putting a vacation on a credit card.