I think everyone has a right to express their opinions - including you, and those who disagree with you.
You have the right to express personal opinions about autism that others on this forum find antagonistic and hurtful. But if you choose to exercise that right, you need to accept that people will take offense. Own it, and don't play the poor innocent teenager being 'suppressed' by the mean adults.
I think what isn't clear from your own perspective is that basically you insulted members of this forum, and we called you out on it. If that hurts your feelings - stop insulting people. Problem solved.
That being said, I completely understand and forgive you, because I think it's due to autism that you simply cannot see how your statements come across as hurtful to others. And I also think that we have misunderstood what you're actually trying to say. From our perspective, it came across as being directed at members of this forum, but you have explained that it truly wasn't intended that way, and I believe you.
Basically, we agree that people shouldn't just go around frivolously deciding to 'celebrate their autism' without a qualified professional diagnosis, in cases where it isn't causing any kind of of impairment in their lives. Also, at this point I think we agree that these (alleged) people generally are not found on WP, so you've cleared up that misunderstanding.
So I think we're really on the same page, and that we've made good progress toward coming to understand each other better. Keep on posting - but again, if you feel the need to rant about autism being over-diagnosed, and you truly don't want to create drama, you need to be clear that you're not talking about anyone on WP.