The person who should have the final say in this is the baby. If she or he is all right about feeding in public, that's the right way. If she or he prefers more piece and quiet, that's the right way. And the judgement about what the baby likes is up to the mother, taking into account how she feels about it, because if she isn't comfortable the baby isn't going to be happy either.

And it's got nothing whatever to do with bystanders.