This is larger than board behavior. I found most humans aren't willing to entertain different opinions. The more you express yours and especially if it's different? People tend to rune you out, wait for you to stop talking, and once you do state what they were going to say regardless.
Pay attention to you interactions with people and you'll see what I mean. Pay attention to how many times people ask questions back after you've asked them a question.
People want agreement and they want to talk about themselves. Next conversation you have ask the person questions, but do not tell them anything about yourself or relate.
My bet is they won't ask about you.
If you find someone who does? That's a person that is a potential friends, because they express interest in you and your thoughts.
Here in the boards it's even easier because of the vote button. Imagine if in real life unknown people could down or up vote your conversation. I imagine you'd experience similar results.