The fact that some user of a functional language is arrogant has no bearing on whether you should use it for your project.
If you think that it does, then maybe you shouldn't be a programmer, for two logical reasons. One is that it is not logical to think that, and programmers have to think logically. The other reason is that for any stack of development tools, we can find someone who arrogantly advocates it, so if the existence of arrogant evangelists is a problem, you must necessarily be discouraged to use anything at all.
What car do you drive? If it's any good (and even if it isn't), there are owners of the same car who arrogantly believe that they are better than others. So, sell it: you don't want to be associated with them!