The Discord channels are unofficial - although Scirra staff occasionally drop by we don't run any Discord channels ourselves and we have no powers to moderate (as far as I'm aware anyway).
One of the keys to keeping a good community is good moderation. If people are being unreasonable/jerks/trolls, they need to be punished or banned. We do this on the forum, e.g. we occasionally lock any particularly bitter or flamewar-style threads to cut off unhelpful discussion, and ban the worst offenders. This doesn't mean the forums are perfect, but it generally prevents things getting too ugly.
This doesn't appear to happen at all on Discord and things regularly get really ugly with apparently no reaction from the moderators at all. Just today I was on the Discord and someone was directly and personally offensive to me with language that would qualify as a ban on the forum. All I can do is block them for my account, but apparently they can still hang around and keep saying stuff like that with no consequence. That sets a really poor tone for the channel as a community space and can easily degrade even further in to a toxic environment. This also reflects poorly on the wider community.
The last few times I've been in the other Discord have been totally miserable experiences to the extent it makes my job worse and more stressful. I'm going to stop going. The moderators need to *seriously* step up their game and clamp down hard on the kind of things that go on in there, otherwise I'm not coming back.