How to Deal with Mistaken Identity?

I’ve just come to realize a bunch of people in a very online subculture I kind of barged in and out of last year think I’m some other horrendous person or persona P. I actually don’t know who P is but I just know he or she has somehow pissed off a lot of people. While I don’t have to worry about getting fired or emotionally startled (https://en.wikipedia.org/wiki/Sunil_Tripathi) I’m worried this might affect my personal reputation going forward.

What’s the best course of action going forward?

I’m assuming its to just ignore everything and carry on since I'm a nobody. In the worst case if it does seep into my personal or professional life I will just explain the confusion. My thinking is people online seem to get distracted by some new thing sooner rather than later.