Why are people (strangers) so rude in telling me what to do?

Sometimes when I drop a used tissue/serviette on the ground I have complete strangers telling me to pick it up, or use a bin or other aggressive phrases. Seriously NOT THEIR BUSINESS!!. It all biodegrades in like a couple of days. Why do people think they can comment to me when I don't know them and they are... show more Sometimes when I drop a used tissue/serviette on the ground I have complete strangers telling me to pick it up, or use a bin or other aggressive phrases. Seriously NOT THEIR BUSINESS!!. It all biodegrades in like a couple of days. Why do people think they can comment to me when I don't know them and they are wrong? Should I just tell them to mind their business next time??
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