Teams isn't that terrible.
On my current gig, we use Teams (free for us because of some Action Pack or Office package - and that's fine because it's one less spend for us) and used to use Slack. I've used Slack and HipChat in previous employments as well.
I'll be honest, I don't see much difference between any of them, they all have their UIX minor annoyances and good points.
Ultimately with all these things it's all about good team etiquette and not interrupting your colleague workflow expecting responses within two minutes of pinging someone (we treat it like email, asynchronous, and for non-urgent communication). To be honest, I dislike the immediacy of these tools and usually mute every channel. If something's really that bloody urgent then just pick up the sodding phone :)