Thanks for the clarification Mentium. It sounds like others in the group are feeling likewise. His “emotional blackmail” needs to be addressed. A statement that newcomers are not being welcomed can best be addressed by someone who is in your position (as a newcomer).
Unfortunately some AA leaders (in this case a group chairperson) do not realize that they do not govern.
He seems to be attempting to exert his will via negativity. This will likely hurt the group if it is allowed to continue. IMO this needs to be addressed quickly. It’s also important to do this in full knowledge that that the character defect that fueled this behavior likely contributed to this man’s drinking.
In this light, tolerance and tact seem all the more necessary. Hopefully he will grow a little as a result of the experience.