If you are comfortable feeding the baby without a cover, you should not care about people around. Do people think as much when they hug, kiss and try to be intimate in public? Haven't you come across many people being cozy in the public! If that is not being looked at being cool, then your case is the most genuine and valid of all. You are feeding your hungry baby and no one has the right to make you feel about it. It is your right and so is your baby's. Ignore such people hands down.
Magbasa pa