tbh, most unrealistic part of Stranger Things is that they don't reference things that happened in previous seasons more. I choose to believe that they make fun of each other a-la-Lucas and Max singing Never Ending Story at Dustin a lot more than they show:
Dustin: not right now, Lucas-
Lucas: BuT wHy ArE yOu KeEpInG tHiS cUrIoSiTy DoOr CLOSED Dustin??
Dustin and Robin, simultaneously: I don't CARE about Tina, or Uncle Jack's party-
Steve: I WAS STRESSED OKAY
El: Hop wants to talk to you
Mike: oh is it about my SICK FREAKING GRANDMA
Lucas: I need to tell you something, but it's a secret,
Max: should we go to the arcade
Anyone: Who do you work for?
Steve and Robin in unison: SCOOPS AHOY
Mike: I'm going over to the Byers to study with El and Will
Nancy, innocently: Oh, what's your test on, human ana-
Mike: SHUT UP SHUT UP RIGHT NOW
Dustin: I'm feeling low, I could really use a win
Steve: Aw, I'm sorry buddy, do you want-
Dustin: I'm going to challenge you to a fight
Steve: ... what the hell, dude
AND NOW THE ORANGE MOHAWK, I call bull, real life friends would be all over that: Don't let Mike make any decisions, he wanted to get an orange mohawk last year.