I don’t disagree, those kinda things (stimulation, people) can be issues for ASD, but I think they can also be ADHD issues. I love people and am very sociable, but because i struggle to talk about things “normally” and get bored easily I really prefer small groups of close friends.
I’d happily hang out with my close friends pretty much all the time, especially if it was just two or three of us. But if its a big group, I get easily bored and end up interrupting / dominating the conversation, or I just switch off and play on my phone, or just leave.
Even if when I’m having fun in a big group, I will involuntarily start eavesdropping on another conversation that’s happening in the group and stop being able to focus on what the person I’m talking to is saying. If its a fun drunken party, it can be okay to shout across the room to join another conversation, but it’s often very rude, especially to the person right in front of me that is telling me something and I’ve just started to blank… So small groups are easier.
Similarly, I love the busyness and novelty of the city, but since moving to the countryside with my partner, I realise how much background noises and stuff happening was really distracting me and making it harder to be focused and relaxed. So now, I do prefer the country.
Tldr: if you have problems with attention, that can impact social interactions, and how you react to stimulation. This leads to similar behaviour as someone with ASD, but for different reasons.