I would not be surprised if the OP is long gone by now, however
It's too bad that this evolved how it did, I think that DW_a_mom made the point best, there were a couple of things you said that struck specific nerves here. Don't get the wrong impression of the people here or of people with AS in general, when faced with these attitudes in public I suspect the reaction would be much more controlled. However for many this is a place where they can go to forget about the negative stereotypes of the general public, so seeing them show up here is hard to deal with.
I would equate this all to walking into an AA meeting, drinking a beer. Alcoholics will have to see other people enjoying alcohol around them every day, and will have to be tolerant of that if they are to remain sober, but seeing it in an AA meeting is much harder to deal with.
As you mentioned you were bipolar, I would ask that you view some of the medications prescribed for AS (especially the stronger ones) like the use of lithium to treat bipolar disorder. From what I have heard it is very effective at suppressing manic episodes, however it has a numbing effect on the person internally and can take away an important piece of who you are.
I would like to give a couple pieces of advice, for what they are worth.
Even if you fear what AS means for your son, do not let him see this when he displays an AS related behaviour. Knowing at 5 that there is a part of who you are that your parents are deeply afraid of is hard to deal with. Just because AS behaviours can be suppressed, that does not mean that you have solved the underlying problems that caused them.
Your son may behave one way when he is around you and others he knows well, and completely differently when only with people he does not know. You have to accept that other peoples descriptions of his behaviour can be true, and that the problem may be worse than just what you see when he is around you.
If you son shows a special/obsessive interest, try to support it. For many people with AS these interests can lead to careers that are both financially and personally rewarding. AS often lets people excel in specific areas with relative ease, finding these areas is important.
Although AS makes specific things very difficult, don't let people tell you that it makes anything impossible, you just have to go about most things differently.
I wish you and your son the best, whatever your struggle turns out to be