Lol, no.  I’m an Fi dom.  My priorities for typing people are how I’m feeling that day, which I can separate into three categories:

1. Lazy.  Trying to fill the queue by exerting the least amount of effort, so I’m watching people I already have an idea about (not necessarily in my asks).

2. Diligent.  I’m working through the list of asks, trying to keep a decent variety of types, genders and races.  FYI I am asked most often for white ES men, so I also spend the most time not typing white ES men.  By the same token, if you’ve asked me for someone you thought was an INFJ and I haven’t posted them, I couldn’t tell what they were, but it wasn’t INFJ.

3. Highly motivated.  I’m off list and hunting for introverted N types, probably.

I don’t tend to spend very long trying to type anyone, so if I can’t figure someone out quickly, they don’t get posted.  I am, however, more likely to match their type to someone in the future.

And to answer your other question, I have typed many people I found unpleasant to watch.  I decided when starting this blog that I wouldn’t exclude anyone based on my moral judgement of their nature (although if anyone wants me to include a tag so you can tumblr saviour yourself from looking at rapists, etc., that is a thing I can try to do).  I think there are many reasons why people would be interested in the MBTI of people they don’t like and I also find analyzing my own reactions to the people I don’t like interesting.