There's a free public library not far from me. It is annoying when people come in and make noise.
Unfortunately sometimes tweekers (meth users)come in and sit down and carry on with loud conversations with nobody nearby to them. Usually the librarian will politely ask them to be quiet and will ask them to leave if they continue on. It's uncomfortable even if they are not making noise. I don't know why they don't just kick them out to begin with. I say this because they are showing signs of disorderly. Almost always they don't use the facilities for the purpose. I've seen before where someone who was drunk was asked to leave with no warning not sure why these individuals get a chance to stay.
There you have it my rants and complaints about disorderly people in libraries, haha
I have noticed that the modern days have changed the libraries. The quiet zone is much smaller and is infringed on more. Take care