Some random dude walked up to me while I was waiting outside a food place for my food and asked me this question.
I said “no, I dont give out random favors” and something along the lines of that’s sus.
Is it rude to say no to random dude that asks for a favor?
More broadly, I think it’s appropriate to respond to social overreaching with rudeness.
In situations like these, I tend to just not respond but simply look at them. Awkward for everyone, but not aggressive on my part. Leave the ball in their court, if it’s a simple “could you take a photo” then whatever, but if it’s a less acceptable “could you buy me some smokes” then you’ve not mentally committed.