It would make me uncomfortable if someone was trying to have a conversation with me while they were breastfeeding. Its not an "ewww, gross" thing, more of an "intruding" thing. Whether or not the mother feels its bonding time, or just eating time, I would still feel like I'm intruding, and that makes me uncomfortable.
However, babies crying/screaming is one of the absolute worst sounds in the world - I'd much rather be around a breastfeeding baby than a loud baby.