Be careful when making sweeping generalizations about groups of people. Simply because someone participates in another community is not grounds for exclusion of ZCAP or the Zcash community.
There are always going to be bad apples in any group who are not interested in collaboration, and would rather try to cause drama and be negative. But don’t let a few bad apples spoil the whole bunch.
Also, as has been discussed before, some prominent Monero community members are already in ZCAP.