I do spend my time in libraries, thank you very much :) Didn't expect there to be gatekeeping on libraries, but here we are.
And a big part of such activities is either that they're cordoned off and airgapped (and are done on select timings which are telegraphed way ahead of time) or are themselves quiet. Drinking and socialising to me don't come under that same category. I've been to a library next to a board game shop and been struck by the difference in noise level and distraction there, so if it comes down to what the OP is actually suggesting, I'm skeptical it won't intrude on others' needs for a quiet, private place.