I think it's important to approach this topic with some nuance. There is a wide variety of intelligence in the animal kingdom - ranging from primates down to bivalves, which lack a distinct "brain" at all. In terms of intelligence, a lobster is closer to some insects, which we seem to have no problem killing en-masse with chemical agents if they enter our home or threaten our crops. I'm not sure it's totally knowable whether lobsters have the capacity to suffer, but moral consistency on this issue would require sacrifices far above just "not eating meat".