It's not a hard rule, although often people at similar levels of the spectrum will get along better than those from different levels. The resulting interaction is a little different from when two normal people with a shared interest connect over it; folks on the spectrum are quite good at "downloading" while the interlocutor "infodumps", and good luck getting a neurotypical to participate in this sort of interaction if they're not making a conscious effort to be polite... ironically enough, this effort is quite similar to how high-functioning autists describe that they can mask their condition and behave normally, although it takes a continued conscious effort.