So having spent over 10 years as part of, and in leadership in, the XDA community I have seen my fair share of this sort of thing. One thing I have found to be extremely helpful is to recognize that quite often these type of responses come from the passion they have for the community/product/topic.
Passion manifests itself in a lot of different ways for a lot of different people. If you can reach out to them personally, either via PM or getting on a call, and figure out what is driving their responses it can go a long way to changing the tone - and even getting them involved to finding a solution is a good step. Notice I said “can” because sometimes you just can’t change their interaction or their feelings or their behavior/tone. At that point you need to have in place a public process for how you deal with it, and just do it.