a word of advice: do not contact someone who is deliberately trolling the tags with flashing gifs. when you send them messages to yell at them, you are only feeding their ego.
they know exactly what they are doing. they want one thing, and that is to provoke and stir your emotions. when you message them, you are only giving them the satisfaction of knowing that they succeeded.
just blacklist and report, and try to forget about it. there is nothing more that you can do.