LBT stands for “lesbian, bisexual, and transgender.”
A lesbian is a woman who is emotionally, psychologically, and/or sexually attracted to another woman. She need not behave or dress like a man, although it is her right to do so if she wishes.
Both women and men can be bisexual and/or transgender. A bisexual woman is a person whose gender identity is that of a woman and is attracted to both women and men.
A trans man is a person who was assigned the female sex at birth, but believes that this label is incorrect or insufficient and feels that he is actually male. Not all trans men are attracted to women. A person need not be sexually active to be lesbian, bisexual or transgender.
No one has the right to label or treat another person as lesbian, bisexual or transgender besides the person herself or himself who wishes to embrace any of these identities.