In my experience, there's a lot of hostility and arrogance. More than in any other community, I've seen Go developers shut down discussion by closing comment threads on Github; reject pull requests and refuse to debate the merits of the change; castigate people for "not following proper procedure"; and being dismissive or contemptuous instead of humble when they fail to understand a problem that is being discussed (on, say, the official Go Slack channel).
My very personal hypothesis is that this is a case of mirroring. The Go development team may be said to have a laconic, authoritarian style, which is, of course, their prerogative, and which befits their position; unfortunately, a lot of Go developers seem to be under the impression that they, too, can behave like demigods. In particular, Go developers, more than other cultures, seem to get an ego boost out of telling people "no".
But this is a generalization. There are lots of friendly Go devs around, to be sure (I hope I'm one of them). I'm particularly happy with the Kubernetes team. At the same time, I do think it's an issue and one that the community needs to be aware of.