Through mutations in the DNA of bacteria, they can adapt. Only the mutated bacteria would live and keep producing bacteria with the same mutation. Eventually, they would be immune to antibiotics.
That situation is a tricky situation...i wish i knew myself.
First, establish relationships with your colleagues. This provides an avenue for you to communicate your ideas and this can improve the mood in the office. Second, avoid misunderstandings among colleagues by promoting a positive environment in the office.