You have to keep in mind that this is a kind of game. Almost no one truly, really hates the other product. People don't get into fistfights over Vim vs. Emacs. It's just a community joke.
So for instance I'm in the IRC camp of group communication, and I'll go to great length to use it over Slack, but if you really need me to use Slack and it makes sense, then I'll use Slack. But I will be doing cynical jokes so that you won't forget I'm in the other camp :P.
>People don't get into fistfights over Vim vs. Emacs. It's just a community joke.
Unfortunately, this can get out of hand, see systemd death threats. Hope people will learn to be nicer on the internet now that the general population is on it.
I actually had a real-deal power struggle with an employee once about using hipchat instead of IRC. They refused to use hipchat, then left the company eventually. So it's not a game for everyone.
So for instance I'm in the IRC camp of group communication, and I'll go to great length to use it over Slack, but if you really need me to use Slack and it makes sense, then I'll use Slack. But I will be doing cynical jokes so that you won't forget I'm in the other camp :P.