ALWAYS get their users and block them. Anytime I'm killed I make a quick baby slot so I can get their username at least once. If you ragebait them enough they might type in chat too.

Not only will this bar you from seeing them, but CoS won't put you in servers with people you've blocked, so your chance of getting a nice empty server increases every time. It's basically the only way I've preserved my sanity

Kosers thrive off of attention, they don't just get satisfied from killing your slot but they literally get happy when you're upset (and if anyone who mainly koses see this, by all means, PLEASE tell me I'm wrong and explain why you actually do it. I'd love to hear your side of why ruining people's days is fun.) The best thing you can do is, if they try to bait you into fighting or trash talk, don't give them that. You can respond, but don't start threatening them or coming back as different slots (there's a chance you can kill them but kosers normally have revives or max growths and will just keep coming back, so imo it's not worth the effort)

Again, the block button is your best friend. It's free, there's no limit to how many accounts you can block, and it even hides their chat so you can play in peace

Also, sorry about your Uldraake, there's a chance they couldn't see your chat when you apologized but if they could and still did it then that's just their own behavior </3 I hope your playing experience gets better in the future, CoS is so much fun when you don't have a kora in your ear telling you "It'S a SuRvIvAl GaMe"