probably not the right attitude to have though. Playing with a premade can be an audition of a sort giving you the chance to get invited into their group.
Now playing against one.... I'm not going to comment. I have no idea if I'm going up against a premade in LoL. * Most games put stars by their names to indicate this but never noticed this in LoL
It's normally easy to tell a premade because a lot of the time they have the same group tag.
I've run into a good deal of drama when playing with premades.
Recently had a Karthus game where our Garen top came storming down mid to get a kill on the enemy mid but he ends up getting double teamed by the JG and mid and dies. He goes on a rager calling me useless and such ... I COULD have pointed out how unlike him my champ needs mana and I had zero at the time and was trying to back (the fuck am I gonna do with a manaless Karth, Auto attack them to death as I chase them into in their jg?) but I noticed that he and at least 2 other people had the same group tag. So if I say a damn thing against him I'm sure it's just gonna make things worse there for I had to mute him and report him after we won.
I found out that I had to do stuff like that when dealing with premades because some time ago I played Poppy top and died to the Croc ... it was close but he killed me. The Rango JG decided to run in at a slither of HP like 10 secs after I died and he got killed. He raged in chat about me feeding the Croc, blaming me for his death. I speak up and suddenly I have 3 children telling the enemy team to report me as they systematically blame everything wrong on me. And you guessed it, they were a premade with the same tag. So yeah, now if I ever have words to say with someone in a premade i just don't say em.
I've had games where people talk about RL stuff in chat, forcing me to mute them all cause IDGAF who is talking about who behind their back. Had games where 2+ people go AFK for large spans of time, costing us the game. Had premades refuse to FF. Had premades force the game to go on by not helping me push objectives and just farming or running around after we win teamfights cause we wanted to fight more ... and that ends up getting us an L because they don't realize how much a Jax scales in late game.
I think it's just a part of being human. It's easy to see someone outside your group as "the other".
IDK, maybe I have the wrong outlook on this but these kinda things don't normally happen when everyone is clearly solo.
Seems like being IN a premade is fun as shit though and common sense tells you that toxic behavior greatly goes down when people are playing with others they know and everyone's getting the role they want. Still sucks to be the out sider when you're grouped with them.