People who say that if you have time to complain, you have time to change things are idiots. Why? It took me 20 seconds to type the first sentence of the post. Now, if I was to tackle a common problem- 'losing ten pounds' or 'being more organized', at least a week would be required. Losing ten pounds would require planning out exercise- "should I wake up at 5:30 to run three miles?", a meal plan (which includes figuring out what exactly is healthy), and then actually doing the cooking and running. This is hours of effort. And of course, this is not easy either- there will be times where I eat tons of delicious foods, and times in which I sleep in. So losing ten pounds may in fact take months, or even a year.
I get the feeling that people who say things like this just don't think about what they are saying, but they should. When people say things like that, they make light of change, which is brutally hard work.