This is common to dysfunctional teams and poor management. While those who cut you off might be over excited, others might be plain rude or some might lack empathy, the job of a good manager is to ensure everyone’s voice is heard. Some really smart developers may lack the skill of making their voice heard in such environments, as it happens with introverts or geeks often, and that’s where an experienced manager comes to play and makes sure people are allowed to finish their thoughts without bullyish or immature cutoffs from others.