Hey there. We don't ban people for reporting other players. We'll let you know about the no naming and shaming rule, but unless you do it a bunch of times, it's not something we action accounts for.
If you can get a video and send me a private message, I'll pass it on, but we don't normally ban people for griefing. I'd love to see that happen, but it would also require someone reviewing videos non-stop. Most likely, many of which wouldn't even be actual greifing situations. What we need to do is have better anti-griefing features to handle those players. Unfortunately, the best I can recommend is that when it comes to drop-ins, only play with clubs instead of with random players in the outdoor rink.