It's one thing for someone to say "you should" for an entirely self-serving purpose (e.g. "you should follow me on Twitter"). It's an entirely different thing for someone to offer suggestions that may be counter-intuitive and deserve further exploration. You should learn to appreciate the difference, and think for yourself before venting.
I am able to put forth new ideas into the world without convincing others that my ideas (and by extension myself) are acceptable, and others should be too.
Oddly enough, by actually giving an in-depth explanation of my beliefs and putting forth an idea I believe deserves further exploration, I will no doubt be downvoted anyway. So why would I care about being constructive in a place that rewards popular ideas and punishes unpopular (although possibly valid) ideas?
Telling me I should do something is a lot more annoying to me than presenting the information you're going to tell me anyway, and letting me make my own decision.