I'm going to give you 4 ways to be hated in Minecraft if you are new to it :D

Number 1 : Killing in a mine, I can't tell you how many times someone has died in a mine because some jerk saw they got diamonds and he wanted them or he killed him for no reason.

Number 2 : Asking for OP on the servers and saying "'i'm from Planet Minecraft" , I only saw this happen in a server once but I heard of story's of owners giving people admins

Number 3 : Griefing : I've seen this happen So many times I can't even count it you accidentally

Break one block and you're banned

Number 4 : Spamming : Spamming Just spamming

Number 5 : Not Knowing how to spell : if somebody scolds you and you flip out and you're like "FUK YOUA HOL YOU SUK" then people on that server are going to be like "I didn't know they let 5 year old's on the server"