What does it matter if we do? I'll stop "defining" myself as gay or lesbian when everyone else stops assuming heterosexuality.
I don't care what individuals want to call themselves. That's up to the individual. Does it not bother you when bigots use the term to denigrate and insult other people? Wouldn't it be better if people respected you as a person regardless of your sexuality?
Why can't you accept people when they are categorized?
I accept people as they are, I don't have to categorize them based on their sexuality. Not sure why you find that important to be honest.
If people who are attracted to the same gender choose to call themselves gay, are you saying that the rest of society should not use that term?
If I were to say that society should stop categorizing people as men and women, would you agree? After all, we're all humans, why do we need to categorize by gender? Sometimes people use those terms as insults. It's 2016, why do we have to label people by their gender, can't we simply accept them as people? Yes, this is a bit of a silly analogy, but hopefully it gets the point across.
The idea that people are more than any label or characterization, that we should respect people for who they are as individuals rather than whatever group we might categorize them as, is laudable. However, I think you are throwing out the baby with the bathwater, so to speak. Labels can be useful and a reasonable means of description. I'm not sure why you would fight to remove all labels, at least in this particular instance, rather than just hope to stop people from using those labels in a pejorative manner.