An absolute lack of consideration in regards to chat etiquette. Man now that I think about it, it's chat threads/notification in particular.

People who carry on side conversations in threads. You're giving everyone else who has participated in the thread the choice of "disable notifications for this thread and risk missing something relevant come back around, or get a notification for every single side message they're sending". Especially when someone is chiming in like 4 hours later. "Glad you guys got this sorted out". Yes, all 12 of us on-call people in this thread needed to get that message direct to our phones at 3a.m. 4 hours after the outage has been resolved. Thanks for that. Very fucking helpful. High value communication.

People who will not use threads. I don't need a new fucking notification every 20 seconds because you guys are deciding to have a chat about e-bikes. Make a goddamn thread or use a room made for chit chat, we're all on the same team, we're all in on-call positions. I'm paid to respond when this thing makes a noise. I am NOT comfortable muting the team channel.

It's addressed elsewhere in these comments, but +1 to folks who just message you "hi". Go get stabbed.

On the topic of notification fatigue:

People who will just not finish a thought.

Before hitting their enter button.

So they end up like doing this thing.

Where you get a notification every 15 seconds, because they are just absolutely addicted.

To their enter key I mean.

They are addicted to thier enter key.

their*

Oh.

I guess I could have just edited that message instead of sending the correction with the thing.

Asterisk? Asterisx? I forget what it's called.

LOL.

Anyway, that thing.

Also, when I'm helping you I am 100% going to stop what I am doing every time I get a message and read the message. There's no way for me to know whether or not you're messaging me "Oh never mind, I had a typo" or "here is more relevant info to make your work easier". That message may very well have immediate impact on what I'm doing, and affect the course I take. Of course I'm going to stop what I'm doing to read it. So maybe don't wait 5 minutes to send me the message "k" after I kindly, thoughtfully provide you with the status update "I think it's the fizzibob, let me verify in the logs real quick" of my own volition so that you are not only aware of what's going on, but don't have any question as to whether or not your question is still being looked at.