She's an immigrant. She most likely carries with her immigrant values and ways of doing things. Additionally you are a community outsider. Immigrants still operate on very very tribal ways of thinking and conducting business. The nuances of western culture are lost on most foreigners. Especially those with the IQ of Africans or Jamaicans.

You insulted her by not buying anything and wasting her time. In her value system if you came to her store you should buy something.

Also new york is full of nonces and weirdos. You don't know what she deals with on a daily basis. She probably does have men just wondering in and hitting on females that work at her store. For women, even american women, calling someone a pedo is a way to alert other men in the area that they need support. She was calling in the backup so you'd leave and stop wasting her time.

Bottom line. When dealing with foreign small business people you'd better not assume western values and western dispositions. There are parts of Britain and France you can't even travel into if you're not Muslim. The world is retribalizing. Get use to it.