I know I'm dealing with autistic folks when social interaction makes me feel neurotypical

Social rules are made up by neurotypicals. I never signed a contract to be governed by them.

If I get along with someone for more than 30 minutes there's gotta be something wrong somewhere.

I have a coworker who always chooses me if she needs help or has to work with someone. I asked her why, hoping it wasn't a romantic reason. She said because I don't do a lot of small talk, I listen to her info dumps without cutting her off, unless it's questions to clarify, and I don't talk just to fill the silence. Basically she's comfortable being herself around me.

Me with ADD:

Thats exactly how it is for me. I see people stimming, getting stuck on topics or going down a rabbithole and thinj: that person sounds cool. :)

But yeah if I approach them and its easy, they're definitely npt NT.

Neurotypicals know you're autistic too, they just don't point it out because of social rules.

Yeah, I am not always great at reading people, so I can almost guarantee I'd fail to detect another fellow autistic person.

i've never been able to pick up mannerisms from anyone.

i dont go to socialize so no

It's how I've met most of my friends xD

The autistic radar.

Yes, I've noticed that if I wonder whether someone is ND then they usually are. I wonder when I see a behaviour that looks... familiar. Even if it's just a picture, sometimes I can tell by the way they're posed or their expression. I asked my friend about her little cousin from a family photo once and she seemed shocked, because the family had been wondering the same thing!

Yes, but it doesn’t always occur to me why I find that particular person curious/interesting.

When I was little I liked the still ones. I could get along with them.