The word aspie on its own is not offensive. There are people who have Aspergers who use the term to describe themselves. The way you use it, however, is unquestionably offensive. Here’s a post you made in the sushi thread:
In this case, you’re not referring to someone who has Aspergers. You’re using it as a put-down against people who are, as far as you know, neurotypical. There’s no credible way to interpret its use here as anything but an insult aimed at people you find to be immature. And in using aspie as an insult, you’re implying that people with Aspergers are as worthy of derision as the people you’re attempting to insult.