How to deal with jerks in your life that are still living in the past?

In college, I came across these two cousins that used to pick on me in middle school. At first I didn’t recognized them as I haven’t seen them a long time ago since I moved away. They were both staring at me as I walked by for some reason and it didn’t occur to me why at first. Until one of the girl mentions to her cousin (loudly and obnoxious enough for me to hear by the way), “Hey, isn’t that the girl you used to beat up?” and started snickering. It finally occurred to me who they are and brought back some bad memories. I just took one look back and didn’t say a word and Ignore them. At the same time, I kinda feel sorry for them since they still haven’t moved on from that stupid middle school drama after all these years (It’s really pathetic, actually. Hello, We’re in college!).

Flashback:
A long time ago in middle school, I used to have these problems with these girls at school. The middle school I attended at the time was very ghetto and had brought the worst out of people even some people that I used to be friends with in elementary. Back then I used to be a very shy, generous and self-conscious girl which makes me their easy target. These cretins would sometimes harass me, make fun of me whenever they had the chance, and talking s*** about me behind their backs. They basically treated me like I was a loser. I used to believe they were right once, but I realize it is just their way to bring me down and I basically ignore them and continue with my classes. Whenever one of the cousins started to pick a fight with me and I would report her to the principal’s office, the girl would always make excuses to get themselves out of trouble. Worst of all, she would unfairly blame the problems on me that I started the fight which got me some referrals and detentions. (Though there is this one time when she finally did got in trouble for harassing me due to witnesses.)

By freshmen year of high school, I basically moved far away from another city (not because of my troubles in MS), started a new life, made new friends, join a sport and organizations.

Fasting forward to present day:
I have obviously change a lot since after MS and mostly full of self-esteem. I have gotten through a new life that they never knew. I almost even forgot that I ever did have problems with them in MS since I moved on. However, now that I discovered that we now attended the same college I’m still the same girl that they remembered in middle school to them. It a big campus, I know, and I won’t see them much often but I’m still concern about what’s going to happen next incase I bump into them again…