That one annoys me to no end. Hearing are more likely to accept info from the hearing than the deaf population. It's especially blatant in the CI threads.
And ironically enough, a lot of white people are taken more seriously in the discussion of race. Often people of color who are opinionated or well-versed in race issues are seen as driven by emotions and therefore inherently biased. Of course we could say the same for white people but that rarely ever gets noticed.