I would caution not to think in black-and-white terms regarding niceness and jerkiness in people.
There are indeed some people who are consistent in behavior: "That little old lady is so kind to everyone...that one guy is a cantankerous blowhard, everyone agrees."
But generally speaking, it's not either-or. We talk about non-binary in regards to gender perception. Truth is, it applies to behavior. Someone may be a complete and total jerk to you, but be as polite as pie to me. Whether or not this person is a jerk would be a matter of opinion or interpersonal experience.
I also think misconceptions are commonplace. Generally speaking, Aspies are more likely to get confused and deeply try to deduce how/why an individual is behaving a certain way. NTs, I find, when confused about another's behavior, will default to "I don't understand, THEREFORE: this person is being hostile!" even if that wasn't the other person's intention.