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?
I guess you could say OP’s wording was a bit rude (stylistically, not in substance, imo). Personally I’d go with a “No, sorry.” or “Sorry, in a rush!” if on the move, and leave it at that as elaboration leaves the door open for them to pry. Either way the question is about whether it’s rude to refuse, not whether the specific example was.
Personally, I’d rather assume OP is chatting/providing more context rather than fishing for sympathy. Many of the comments that say it is rude also say but not if it’s a rando, which it was.