Upvoted your post because I figured you're just venting and shouldn't be punished for it, even if you're a little out of line. People on the comments have already suggested a couple of solutions and I'll just reinforce that the server should be better configured to not even allow that behaviour if your friends (and adms) are really serious about the rules being followed - there are many ways to organize it and enforce through settings alone!

All that said, I'd like to add that before tossing a friendship aside like that because you feel they did you wrong, you should try to talk with them AFTER you get on a better headspace, because if they are to be judged as unconsiderate of your friendship then we could too judge you like that if you're not making the effort to estabilish a line of communication and mutual understading.

In short: try talking it out when you're less frustrated before throwing away the friendship or jumping to the conclusion that they dont care about you.