So when you asked if this is reportable in questions I thought you meant the person was actively mass negatively reacting you and had said that they were doing it so you'd get banned, not what this is.
So if you reach -250 you won't get forum banned. It's a joke. There is no auto ban set in place. You're fine.
I can see in the clip that you called the warden a larden for not picking the minigame you wanted to play, then you went straight into the blue's melee range which caused that blue to freekill you when they were trying to hit a rebeling red. You then say you're going to report them and that's when the hostility starts.
I'm sort of dumbfounded that you're not aware that your actions are going to cause negative reactions. If you do this stuff in game and on the forums, people are going to bite back. They aren't just going to sit around and tolerate your behaviour.
So when you are hostile first, you are going to get it back. You need to relax.
I only had a brief look through your posts and those with negative reactions made sense, wasn't some senseless bombing you. The people who do it are random at times. Can usually be the same people, but overall doesn't look like coordinated mob voting, just people mass reacting negative which isn't against rules. Again, to point out, if they purposely did it as a group in a coordinated attack sure it's vote react abuse. But it doesn't look like it. Just people reacting to the content they see on the forums.
If there is a specific time were it was you need to point it out in a report. I don't have the patience or time to go through every single one of your posts to see abusive reacts.
You'll be able to see your reactions via
https://www.panda-community.com/account/reactions . If you see a pattern of reacting to old content, then report that. If it's just a one off, don't bother.