As limited as my experience is, I have found one trait that is generally present in this spectrum called intelligence. That trait is the capability to entertain nuance. That is, I think that intelligent people tend to be able to entertain nuance in their heads; to realize different perspectives of an apparently simple, straightforward issue; to not see everything either black or white. Ironically, the intelligence spectrum is accompanied by the ability to detect spectra, instead of discrete, perspectives on certain issues. They do not generalize too quickly; they do not often adopt binary stances. Per example:
You are either a feminist or a sexist.
This statement might seem reasonable to many people. The definition of feminism is the equal treatment and opportunities for both men and women. So if someone is not a feminist, they are against equality right? Of course not...
Definitions describe usages.
That is, if I open the dictionary and look for the word feminism, I will find the previous definition I mentioned. But that only describes how people generally use the word. It does not describe the actions taken by the people who adopt the label. As an example, say that I agree with national-socialism. I have read their programme and I know what they purport to do and put in action - nothing includes immoral actions, like killing and torturing. So I declare I am a national-socialist. But after a while, I discover that they take actions that were not included in the programme; they start killing, censorship, segregation. Angry with this, I go talk to the chief and I say What is wrong? This is not national-socialism as originally described!, to which they respond How so?! Just go read our programme! It's all there - that's what we stand for!
There mere fact that definitions exist is irrelevant. The actions and the people that take those actions are what is relevant in reality. Going back to definitions changes nothing - it doesn't magically erase actions. Therefore, I could not care less about definitions; the mere fact that this argument is the most used by feminists to defend themselves each time they are criticized informs me on the weak mentality that some of these people possess. If they had a case, they would talk about actions themselves and not about definitions.
This is a perfect example of people who are incapable of entertaining nuance. In their heads, everything is organized in labels. You label yourself as X? Ok, let me see what my brain says about people with label X (...) Here it is! X people are not Y people and they are evil because they support Z people. Much like the drawers of some obsessively-organized person, they have a label with all the descriptions they need to know about each type of people. They are incapable of accessing individuals individually and thinking deeper on certain issues. In their head it's either hot or cold; feminist or sexist; evil or good.
There are no shades of grey.