User blog comment:Speedyblue/I Think I Should Tell You This.../@comment-34754462-20180907140020/@comment-34106721-20180907205224

Unless it was a sibling or you are under some sort of public wifi, (ie library etc), then IP addresses are pretty unique. I mean, it does happen, but it's a very low chance that the same person trolling you is the one who has the same IP as you.

But as Angel said, things like this happen.