It might "just be a video game", but some of us have limited free time, and if they keep running into non-players when they get on the game, how is that fair to them? Yeah, real "harmless fun" then.
Of course, leaving the game and entering a new one is always an option if you prefer playing serious over partying.
I've done it before, and it's very rare that you end up against the same people. There's still a chance there will be partiers, but I haven't seen them so much recently from what i've played as of late.
I don't like having an "overly serious" tone in splatoon for any reason though, so I usually end up partying whenever I see someone else doing it in turf wars to make sure they don't feel alone or sad. Even if my schedule was busier than it is now (which i'm hoping it will be soon, i'm actively searching for work since I haven't been able to get anything yet in this small town that's stable and not just seasonal) I would probably try to use Splatoon to relax and play for fun. I guess i'm just not a competitive person, huh.
I really only shoot people on my team when they kill people from the other team that are clearly partying with me and not causing any real harm.
As for spamming super jump, I only really do that with other partiers / when it's an inevitable loss that can't be recovered from I spam superjump on the spawnpoint.
When I don't feel like partying and there's squid partiers, I generally just try to chime in for the match then leave to another game though basically... especially if it's a good majority of the match's members or the entire rest of my team.
Sorry, I kinda ended up rambling about my own experiences and opinions on the matter. I still personally think it's pretty harmless when you can just refresh your lobby after a match.
