No, it can't be extrapolated that way, because the community which uses a language is more than just attitude (arrogant versus humble); the community has a productive aspect, like producing tools, libraries and such. Just the basic attribute of the size of that community could be significant.

Some languages with a welcoming community nevertheless have arrogant evangelists.

You can make your own language and use it; where is the welcoming community then? And what if you're arrogant? :)