LGBT includes lots of people who are marginalized by society. Society's standard view is:
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If you born with a penis, you grow up to be a man, and you should be attracted only to women.
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If you born with a vagina, you grow up to be a woman, and you should be attracted only to women.
Bisexual people don't fit this narrow stereotype. Transgender people don't fit this narrow stereotype. They DO fit with the many gays and lesbians who also break these stereotypes.
I suggest that you discard your hatred for people who are different from yourself. You might be rather shocked to find out that some of the freedoms you enjoy were achieved by the tireless efforts of LBT people. Even by some straight people, too.