If the post that was down voted received nothing but down votes, then it would have a score of 0 or less, and would be easy to identify. If that's not the case, that means that there's someone out there that agreed with you/liked your idea/felt that you contributed something positive to the discussion. Most likely, more than one. So if you make it your goal to not make that kind of comment again, then sure, it's possible you won't be down voted, but you'll also be robbing others of a positive experience.
TL;DR: Stop worrying about your down votes, count your up votes instead.
If the post that was down voted received nothing but down votes, then it would have a score of 0 or less, and would be easy to identify. If that's not the case, that means that there's someone out there that agreed with you/liked your idea/felt that you contributed something positive to the discussion. Most likely, more than one. So if you make it your goal to not make that kind of comment again, then sure, it's possible you won't be down voted, but you'll also be robbing others of a positive experience.
TL;DR: Stop worrying about your down votes, count your up votes instead.