Yes, I agree, this person should persona non grata pending mediation.
Perry is an olderish white guy musician who comes around sometimes, much of the time seriously drunk it would appear. Being drunk seems to clearly impair his judgement and his actions become invasive to others in the ways Ryan describes.
My history with him is only the following. I first talked to him a while ago asking him to turn down his electric guitar in the ballroom while a large meeting was taking place in La Commune - he complied. I noticed he really did reek of alcohol. I asked if he volunteered with any collective, he said FNB - but he didn't know where the kitchen was, or that there was even a basement, which rang alarm bells for me (ie, it was probably a fib.) I later followed up with Helen and Joe and they said they had never heard of him, and that sometimes people 'say' theyre in FNB but aren't really..
Anyhow, Perry left the ballroom and wandered upstairs by the kitchen above La Commune, now playing the mandolin - 'quietly', yes - but alas still distracting to those in the large meeting below, and I again asked if he could play music in the basement or another room in the building until the meeting as finished - he complied, but seemed pretty out of it and not understanding why (drunk).
I later found out that while upstairs he was 'peeking' into the Disco Room on a dance rehearsal that made those inside feel uncomfortable and Sarah sent an email out to that effect. Next time I saw him, I re-introduced myself, took him up to the dance room and let him know that they require privacy and to not do that. He said he had something of one the dancers inside and was trying to return it to her.. I did not verify whether this was true or not, but since the dancers did not seem to know him, it seems doubtful.
Then, one day after that, he was walking into the building and I admittedly gave him a bit of a 'side-eye' on the way in because I wasn't sure if he was wasted or what. He himself came up to me and said, "why'd you give me that look?", and I said, it appears you come into the building drunk, and we can't have drunk people in here - you aren't known to our community, and I don't know what you will do in that state. I said if you want to get drunk, try not to come here. To his credit he admitted being drunk the aforementioned day, agreed it was unacceptable, and said that wasn't going to happen again.
But, since it has happened again, to my mind that is grounds to ban him pending mediation that he will have to arrange.