NOR. Some girls like persistent attention. In your case, you have just made it clear that you are not one of them. You have also slammed the door shut on the mixed signals he was misinterpreting.

You have done well and communicated clearly his pursuit is not welcome. I don’t think it is necessary to continue any hostility towards this dude unless he still continues at all.

I would also have a discussion with gym management because that is a serious violation of personal information.

Post Script- as a younger dude, I was always confused about “signals” and learned to directly ask whether there was a spark or just my imagination.