Let's start off with sh*ttalking in other servers: I know you want discuss with all players about that admin on this server, but you thought about UNLOZE, GFL and NiDE has common players, all informition what you talk on servers saved in demos or chat logs and before sh*ttalk about admins think about it. If you have problems with admin on server, you can talk in PM with high admins they can decide and discuss with you about all or try solve this problem each other.
Mutes and gags in other servers: I asked other admins other servers, i see you have good mute/gag history.
sh*ttalk about admin when admin offline: Don't you think it's meanness, as i said don't misinform players, i know no one admin are perfect, but about sh*ttalk you should have limit.
About rename: Admin shouldn't rename players in insult names, he show disrespect and toxicity, admin will warned.
Admin change your mute/gag from 5 days (because to much) to 3 days
Conclude: If you have problems with admin on server, do not be afraid write about it to high admins, make report in "Admin Abuse" or try solve this problem each other, but no need trashtalk with other players on other servers about that admin, you are misinform players mute/gag fair and was changed from 5 days to 3 days.
Have good day.