Some are not very cautious with what they say in private

Some time ago, I shared something I had written on a blog with someone. After reading it, I remember the person said, "that's what many are saying." I felt like asking, when did you say it or write it publicly for all to see? I didn't bother asking, however, because I already knew the person never said it, and was also afraid to say it or write it for all to see. Many people are similar to this person. They will say some things, but are very careful to say others for fear of what someone might think, or how their employer may react, for instance. To keep this story short, some people think they have more guts than what they actually have.