There was some discussion about this here.
I’ve personally only had issues like that happen a couple times, but I don’t know if I count as a “top identifier” since I’m not in the top 3 for any major group.
I think gently asking the user not to do it would be the best solution as long as it’s not happening too much, but if a lot of users are doing it then it might warrant having some sort of limit (like not tagging more than 2 people per comment, with an explanation when triggered) or a message the first time a user tags another user.