Can you clarify? If you claim that certain people's opinions don't count, you're being prejudicial. That's what bias is. So by your own logic, none of your opinions, even on unrelated topics, should count.
Discussion
it depends on the context of the matter . yes everyone will look be have prejudice including you as soon as u oppose the view, that not point.
when u present BOTH SIDE of coin instead of just ONE SIDE then you opinion n view count after that doesnot matter you choose which side.
advertisers never publicize in BOLD the flaw/risk/warning in their product - that's an example
also u missed first word "IF" lol revealed ur too fast conclusion habit.