A single sentence in team chat, plus two tiny defaults, turns most solo-queue lobbies from snarky to functional.
Drop the pre-match micro-briefing in plain chat

I started doing this after one too many Call of Duty: Mobile ranked games where everyone spawned, sprinted to their favorite lane, and then acted surprised that we were down 15 before the first UAV. The fix isn't a speech. It's a micro-briefing you can type before the countdown hits zero, and it works because it gives people something easy to agree with. My go-to is: "I'm playing objective, call your lane and I'll rotate". That's it. No scolding, no "pls don't feed," no vibe check. It invites a response, and most players can't resist labeling themselves. You usually get "mid," "I'll anchor," "sniper top," or at least a ping on the minimap. Now you know who's likely to hold, who's likely to roam, and you can plan your first rotation without guessing.
Here's the part that surprised me: it also changes what people complain about. When you lose a fight after that line, you get information instead of blame. "Two pushing B" is a lot more common than "where team" because you've already framed the match as lanes and rotations. In games with quick chat wheels (PUBG Mobile, Mobile Legends, even some of the newer casual shooters), I still type one human sentence first, then I lean on the wheel. The sentence makes the wheel feel like coordination instead of spam.
If you're shy about typing, do it on match one of the night and watch how often you get at least one teammate to mirror your tone. Solo queue is a mood swing. You're trying to set the thermostat before the first death turns into a meltdown.
Mute with intent: keep pings, kill the spiral

I used to treat muting like a dramatic breakup: either everyone's unmuted and I'm "being a good teammate," or I slam the mute-all button and play my own game. Both are worse than what most mobile and casual online games let you do now, which is picky muting. The sweet spot is: leave pings on, kill voice/text from the one person spiraling. You want to keep the minimap info, the "enemy here" markers, the objective timers, and whatever your game uses for quick-callouts. You just don't need the running commentary from the player who narrates every death like a courtroom closing argument.
In practice, I do this early. The moment I hear the first sarcastic "nice," or I see the first all-chat taunt that has nothing to do with the match, I mute that single player and keep moving. The timing matters. If you wait until you're already tilted, you've absorbed the damage. If you do it at the first sign, you stay functional, and you can still respond to the map state like a normal person.
This is also where Discord and party chat can quietly wreck a squad. If you're duo-queued on voice and your other two are randoms, the randoms can feel shut out fast. So if I'm in a Discord call, I make a point to repeat one useful thing in in-game chat: "Two on left, rotate" or "Save ults for next fight." It takes two seconds and it stops that familiar online-play paranoia of "they're in a call, they won't help me." If the lobby is going to be loud anyway, make it loud in the direction of information, not judgment.
The two-default loadout that makes teammates trust you

Online play has a weird social tell: before you say a word, your loadout tells the lobby what kind of teammate you're going to be. If you queue into a casual shooter with a pure ego kit, you might be a great fragger, but your randoms assume you're going to disappear the moment the fight gets messy. I started running the same two defaults across games where I can, and it changes how people treat me even when I whiff a duel.
Default one is something that reveals information. In COD: Mobile that's a UAV streak you can earn reliably, not a highlight-reel streak you'll see once every five matches. In battle royales it's a sensor gadget, recon perk, or even just committing to calling out armor pings and loot markers like you mean it. Default two is something that saves a teammate on demand. A smoke, a heal, a shield, a revive speed perk, a utility that lets you cross a sightline without donating two bodies to the enemy. Pick the boring support piece that works every round, not the flashy one that works when you're already winning.
Then do the smallest visible action early: pop the recon thing the first time it matters, or throw the smoke for someone else's rotation, not your own. You'll feel the tone shift. People start trading for you. They stop using "team" as an insult. They ping instead of sighing. It's not magic, it's just the online-play version of proving you're not going to abandon the objective the second you get bored.
And yes, you can still top frag with this stuff. The bonus is that when you do, your randoms don't resent it. They follow it.