It’s already well known at work that I don’t just not like gore videos but that I hate them and actively avoid them.
A colleague sent me a video of a man being murdered by axe via WhatsApp to my personal phone on my lunch break. Before I opened it I asked if it was a video that I would want to see (because I know what sort of character he is), he implied it was fine.
Despite my suspicion I took his word and watched it. I immediately scolded him, he then made light of the situation, I told him that it wasn’t funny and that if it ever happened again I would be making a formal complaint immediately.
A couple of minutes later, another colleague came in to the mess room, the guy that sent the video made fun of me for not liking the video in front of them. I told him that he was making fun of me and that I wasn’t ok with that.
Do I have the right to not be sent murder videos? What would an employer do if I made a complaint?
Another thing you can consider is to find a good mediator and then have a chat with your colleague to talk about your boundaries and about their motives. You got lots of down-votes for your reluctance to complain and have the colleague fired and that made me think that your colleague getting fired might make things worse. Who knows what more horrible things the person would do after that. Something more constructive must be possible.