To throw my opinion in the pot, this forum was created out of a rather large type bias at INTPc. I know that I've always been sensitive to any sign of type bias. I think it does exist, but it's not as bad as other MBTI related forums and I'm just not referring to INTPc. I don't think it's a very prominent problem because people here (or at least I am) are quick to shut it down fairly quickly and I think inclusiveness is very much rammed over people's heads here (in a good way

).
That said, I think biases against sensors creeps up in subtle ways. What I noticed is when celebrity typing threads were more popular people were always typing celebs as some type of intuitive, INFJ and INFP seemed to be incredibly popular. Just recently whatever pointed out how biased and unrealistic it was for someone to claim that all the 2008 presidential nominees were intuitive. Then you have the statements that occur in the middle of threads about how people could never have a relationship with a sensor, etc. I have noticed that ENJs tend to be thought of as lower class intuitives.
I think it's more or less recognizing the "code words" for sensing and intuiting. Like when people claim they're so out of the box (who's left in the box? who wants to stay in the box? who does/doesn't realize they're in a box?) it's like saying you have some higher level of consciousness that few people in your life have. It's that attitude which I think is prominent around here, which can sometimes translate into a bias. Because comparatively if you think you see patterns/connections/meanings that no one else sees and you're convinced those things are real and are quite plain to see if anyone cared to look but no one else around you seems to be seeing it either you think you're crazy or you think everyone else is. It's much safer to believe that you're the flood light in the sea of darkness.
Then it arises in thread like
this one. I noticed how quick people were to confirm that this evildoer was in fact an ESxJ. Or whenever someone comes having difficulty with another asking for help it's usually a sensor that is the crux. This doesn't mean that you can't complain about a sensor that you're having problems with, but look at the rate at which people complain about problems with a sensor or problems with an intuitive. I think someone already mentioned this, but how do you even know the person in question is a sensor? What would happen if a sensor came in complaining about an intuitive they were having problems with? What would the response be?
IMO, it's not necessarily that people are explicitly saying sensors are stupid, it's an attitude that permeates the atmosphere. It's a smugness that no one sees what you see and very few people understand the world in the way you understand it. I'm not saying that I am correctly interpreting things, it's just what it seems like to me. For example whenever there's a hot thread about any of the Big Topics (Religion, Sex/Sexuality, Politics, etc.), I find there's a didactic and pompous air that's wrapped in pseudo open mindedness. Maybe I'm just dull or something, I don't know, it seems like so few people approach a topic humbly. And I know, when I was in college and had my Psychology or Sociology 101 textbook sitting right next to me, I was quick to jump out there and defend to the death what I had just "learned." This may just come down to the demographics of the forum. We have a lot of college students and people in their 20s (myself included) who's personalities are gelling or are incorporating new ideas into their worldview and there's a lot of questioning which is fine. I notice the older posters don't act like this for the most part because experience has mellowed them out.
Seriously, extreme sensors and extreme intuitives are exactly alike in my eyes, I can't understand a damn thing either type is saying. I guess extreme sensors are more stereotypical the dumb rock types but I'd definitely class extreme intuitives as idiot savants.