Well, judging on the previous posts, I can assume you've got an idea of what you should do about other people's opinions. Obviously, new people you meet shouldn't matter to you as much because, well, they don't know you. They're in no place and have no right to judge you anyway.
As for people who "disappear forever" on you, you'll have to reevaluate your relationship with them. How close were you guys? Is it really that important to get upset over the fact that they didn't accept you? If they are the kind of people who won't accept you for who you are, then what does that say about them? Would you want to spend your time getting upset over this kind of people?
If you were close with them and share important memories with each other, then I think it's entirely possible to make them understand your situation. After all, they were your friends; they know you. They know you sum up to more than just a person defined by your sexuality. You can talk to them and open up to them and share with them your story. That is the only way you can get them to try to understand you.
But if they are totally homophobic/lgbt-phobic people, then would you want to spend more time dwelling on them? Farewells are inevitable in life and sometimes you have to say goodbye even to the people who knew you and loved you and vice versa. It sucks and it never quite heals completely but in time it'll get better. It also helps to find others who have the same problem, talk with them, share, and build new friendships. New friendships can sometimes be the best way to heal.