For my birthday, my spouse got me a nicer newer expensive version of a thing I already have. The one I have is older and dented but works just fine. I use it weekly. I never complain about it. I’ve never asked for a newer one. The one I have was given to me by my mother in law, whom I adore. It’s sentimental.
I don’t like new things. When they got me a 3d printer, it was the cheapest one and it was a kit and I had to build myself. I loved it. It’s perfect for me. I regularly buy things used or get things from Buy Nothing groups. I much prefer to repair old things in many ways. My car has over 100k miles. The one before did too. I don’t like new things.
We got into a huge argument because I want to return it. They are so upset with me that they left the house to calm down. Why am I the bad person? Why are they mad at me? I have a very clear tendency for old broken used things. Why am I obligated to like this new thing?
We literally established a rule early in our marriage. I’m not allowed to gift nerdy t shirts. They don’t like them. I love them. I thought they would like them but they do not. So they asked me to stop. This feels the same. I do not like new things. Why am I the bad guy for wanting to return the newer version of the thing I already have?
The way you say “potentially diseased” is pretty rude. That’s not how I view folks with ASD. All of this is because someone who has ASD and thought OP was going through something similar. I have ADHD. If I saw someone speaking about one of the pivotal moments that led to me getting a diagnosis I might say to them “have you may considered you have ADHD and sought a diagnosis?”
What else does saying somebody’s behavior is loosely abnormal and strongly pushing them to get professionally diagnosed really mean if not “potentially diseased”? They literally suggested that it may be autism, something they couldn’t possibly know about someone based on an online interaction.
I’m somebody who is on the spectrum too and I personally believe that autism is a normal difference or neurodivergence - with specific qualities, associated challenges, and diagnostic criteria. I don’t believe that OP’s reaction and behavior fits in this instance.
That’s totally fair that you don’t think it fits, but I don’t think the other user was out of line for suggesting it might.
I feel that suggesting diagnosis is warranted if OP suggested that they might need that level of help and support, suspected autism themselves and was forward about that, or was otherwise having a difficulty commonly associated with the standard diagnostic criteria of autism e.g. OP was having sensory issues.