Iv been a raid leader many of times, its hard to find a balance with newer esc guilds. Usually my best way to shut people up on important stuff and just saying i simply wont do loot untill it gets silenced or a classic see now if ya listen this wouldnt have been a issue approach, after this point people got the deal when it came loot time or to go over a fight. My rule of thumb is you can talk all you want during trash and even boss fights that are on farm, but if some stupid things start happening i usually lock down on it. If ya do your job, talk all you want, i prefer it, but if we start wiping due to people not paying attention then, its going to get quite.