I need an app to help me avoid people I dislike.

In the past few years I have moved back to my hometown after being away for 8 years. In that time I reconnected with a few people I went to high school with, but the bulk of them I didn't care to reconnect with. 80% of the people I went to school with still live in my hometown. This was a small town so there are only 4000 people. It is impossible to go anywhere without running into at least 3 people I went to school with. <br><br>I was at the grocery store and saw 2 people I disliked. One beckoned me over and started talking to me like we were old friends. But he is not a friend, he was an acquaintance in high school and is the reason why 2 of my friends got in a huge fight that lasted a few years. I politely listened to him ramble for 2 minutes, then excused myself when he was distracted by someone else. As I was leaving I ran into my ex-boyfriend. He wasn't actually my boyfriend, but he gave me a ride to school when my mom was in rehab and my dad was on a binge. I didn't date him, but he told everyone we did and even went to my parents house when I was away at college to introduce himself as my ex. It was so humiliating. I smiled at him and waved and was on my way but he chased after me and stopped me to talk for 5 minutes. I have seen him 4 times this year and every time he stops me and talks to me. I have been polite this year, but I honestly don't want to ever talk to him again. <br><br>That got me thinking there needs to be an app where you can mark in real time when you see people you dislike. Then when I am out an about I can turn on the app and see who is around me. If I see someone I dislike marked I can change my plans or go a different way. I know you can do something similar with facial recognition softwares, but I don't want everyone I know to be mapped. I only want to share people I dislike and see people others dislike.