This is what I think
Opinion is another's perception of what he thinks is right or wrong. It's neither truth nor false since one is entitled to believe what he wants to believe. We are given by God the freedom to choose what we think is real.
Does another's opinion matter, certainly it does, but you shouldn't base your choices based on others opinion. You also is entitled to make your own judgment. Especially on our behavior, we should entrust the formation of our being on other's opinion. We should be able to make our own basis of who we are, we may consider what others think and combine it with our own inner guidance to mold ourselves to the most profitable behavior we can have.
But then again this is just my opinion and some people may see this wrong.