I was just sitting at the mall taking a break from mall walking. A man walked over to me when I wasn’t even looking up. He said "I haven’t seen you here before. " I said I wasn’t really here to talk to people and got up and walked away. He said he would leave, he may even have said sorry. I said I was ready to leave anyway. In retrospect I think he may have just been slightly mentally challenged so I wish I had been a little softer, he did not turn out to be aggressive. Looking for suggestions on something still clear and firm but more polite? This scared me for some reason, I think how fast he walked up and sat down near me.
Editing to add a key detail, he sat down close to me which is probably what made me more nervous than I would have otherwise been. I appreciate all the thoughtful feedback I’ve gotten and interesting discussion.


I suspect this might be cultural. In some parts of Switzerland (e.g. rural LU) you’re expected to greet strangers walking past you. Do that in Zurich and you might get the same kind of negative feedback. OTOH, OP’s case was more than a courteous “hello”…
Yes, it’s cultural. It’s also part of the ‘loneliness epidemic’ that is affecting most westernized countries. As a larger and larger cohort of the population becomes socially isolated, especially young adults.
And frankly, I’ve noticed a huge cultural shift in my own city the past 5 years. I used to have way more casual interactions, and now many of those same casual interactions are viewed with hostility and suspicion… just like OP’s reaction.
10 years ago if someone dropped something and you picked it up for them they’d thank you. Now they act get angry with you for trying to help them, and sometimes accuse you of theft or harassment. And that type of reaction basically teaches folks to just not bother, it’s a type of death spiral. Even personally, as the years go by and the hostility ratio goes up, it makes me increasingly want to socialize less in general. Even many of my closer friends from years ago have gone down this rabbit hole of hostility and suspicion, and I stopped interacting with them because it was so exhausting and miserable to be around someone who thinks the bartender is ‘looking at them funny’… no it’s you whose looking at the bartender funny… you idiot.
It is increasingly difficult to find folks who are receptive and open minded to strangers, which is the building block of any/all socialization. And what’s incredibly rare is folks who can just politely say no without demonizing the other person.
As someone who never really got along with strangers ever, I kind of feel like a bad survivor in a shitty apocalypse.
I socialise at festivals, then I forget the people and they forget me. Otherwise, it’s always been more bother than use.
Sad to hear you’ve lost something though…