Disclaimer: level 1 ASD, low support needs

Was it ableist for my ex-friend to say “[all] autistic people make her uncomfortable “?

… maybe? It is true that the majority of Autistic people (including those with subtle symptoms, maybe especially those since uncanny valley and everything) tend to make NT people uncomfortable whether we like it or not, so just having that thought alone might not say much. I would assume most reasonable people would prefer to keep thoughts like that behind closed curtains even if they have those

As for your ex-friend’s specific case… I think the bigger issue is that your ex-friend was an asshole more than anything else. My understanding is that talking behind someone’s back is a big no for most people. There are… some parts of Asian culture where this type of behavior is more accepted, but if your ex-friend is American then I’m not entirely sure