I think these biases happen in socionics all the time...
For example, with inter-type relationships. I think some people tend to take these too ridgly (sorry). They may look at say, me an Ishy (

), superegos, and say something like "Super-ego have their functions conflicting with each other, so, you two are now duals," and one of us is now ESTP or ENFP.
They seem to do this with the functions, too (sometimes ignoring the ID).
I think a lot of socionists "type" people and claim to know their type, without actually verifying it first. This would also lead to misconceptions about types in favor of sparring the socionists ego. Pretty much, everyone wants to be right, and whatever they think they believe is right. This sort of inflatted arrogance is extremely common even among people on sites like this with little (if any) actual experience on the matter. They all think that they are the "guru".
*sigh*