We are not allowed to be too loud at work. We are free to talk but it should be done with caution to know it's a business place.
Being too loud excessively will be be a distraction in a way the business will be affected. It may cause breach in communication.
Having excessive distractions from work especially when it comes from the employees is not to be encouraged in any kind of workplace because this means that the person who is supposed to be working is not actually doing their job but focusing on things that are not going to contribute to improving their work productivity.