Is OTHER wrong in the post ? POST : Throwaway because reddit.

Some background: I have voluntarily for the past 5 years designed a massive sports club website from scratch. This website has the usual site promoting the club but also a database managing members details, attendances and all aspects of the running of the club. Prior to me doing this it was all on paper. Legally we're obliged to keep records for many years. I used to be on the committee but left to just be a regular member when I started full time work. I carried on maintaining the site and making changes as needed by the club. 

Last week I received an email from a committee saying my services had been voted out by the committee. No discussion, no forewarning, no formal thanks, no explanation. I was informed separately that several other committee members wanted in on the action. The decision was ratified at a meeting of club members I was conveniently not informed of or invited to. I am still a member.

I have been losing sleep over this, I've lost a huge project that I really enjoyed. 

Following this I published an open letter, addressed to the committee, sent to the entire membership explaining exactly what had happened. It was completely polite and factual without any of the anger I was feeling (confirmed by several independent people before sending). I immediately recieved multiple emails back from the committee saying that it had been a democratic decision, it wasn't personal and that my letter was unprofessional and unnecessary. I have been threatened with several courses of action for bringing the club and its committee members into disrepute. These threats can swivel as they have no grounds on which to give me any kind of penalty or action. 

Tldr; got sacked out of the blue in suspicious circumstances from a voluntary role I'd poured my soul into for years. Wrote an open letter to the membership outlining the treatment of a fellow member by the committee and now I'm being told I'm an asshole. AITA?