Labeling someone as gay can physically and emotionally damage a person. It can cause them to feel depression, misery, and sorrow. Sometimes it can cause a person to be physically abused and attacked by their peers and others. When you weigh all the outcomes of using the ¨g¨ word for someone it can possibly build up so many negative and unwanted feelings that can lead to suicide. Suicide is never a answer to stop anything.
Personally I have and still grow up in an environment where when you are labeled as the ¨g¨ word you become a outcast. From my perspective there is nothing with being different with what you like, really all that matters is that you are being yourself. So yes, please do not use the ¨g¨ word in a negative way instead use it as a positive way.