That individual is advertising your guild name. It's one thing to do that in unranked, but ranked is a whole other bag. If a GM of whatever guild aren't punishing or kicking people from guild who are doing that, what message does that send?
A toggle you say. BioWare can't implement a hood toggle, what makes you think they will put in a toggle so you don't have to play with people who don't play the exact same way as you.