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Sounds like you're the rude person in this situation. A stranger is under no obligation to offer help if you're not in a clearly life threatening situation. Perhaps he thought it would have been rude to offer to help when you were already handling the stairs by yourself, or your struggle wasn't as evident from someone else's perspective as it was from yours. Now had you asked for help and he had made a rude comment that would be one thing, but instead you just started conflict with a stranger with an aggressive comment and then stormed off. That's rude.