When someone says it's your or their opinion, they are implying that it can easily be dismissed. Everyone has their own opinion and it should remain within those perimeters. Put out some facts in front a someone and turn them into something meaningless. This should be corrected.
It's these things which hold us back from progressing as humans. When something is put out there in a certain way, everyone responding to it will normally provide the same reaction, which is based on whatever the conversational climate is at the time. Comment sections and forums are great ways to measure this, especially when we know that most people will respond to the main post rather than read through previous comments.
Were this to be democratic than we know that the more people respond in a certain way, the more credit it has. Of course, this also depends on the place 'collecting' those comments.
But we get a better idea and that has validity. We cannot nor should we dismiss that as nothing but opinion. The more you look at it that way, the less power they have where even fact can be watered down.
With this comes the validity applied to who makes the statement. A person with higher credibility making the statement makes it valid over a person who has less credibility. No one takes into account that the person who says it might have something such as experience to make the statement. This is also dismissive.
This is also incorrect and it prevents us from moving forward as a society.