There are large departments within large for-profit companies whose entire raison d'être is to lie to the public to make the large company seem better than it actually is.
See: marketing and public relations
Why would anyone ever trust what's said by a company's own staff who are paid by the company to say things good about the company
Obviously this is entirely your choice to make, but this all sounds really rigid and restrictive. If you view someone telling you about their weekend as "wasting time," I have to wonder if that mentality cuts into your personal life too. It's totally reasonable to make friends at work. If the concern is that they'd bring your personal drama to work, then just don't involve them in any personal drama and you're gold.