Leviticus 20:13, for starters.
There is nothing saying you can't love. But contemporary society confuses love with sexual relations.
Also, the Bible is clear about the wrongness of any sexual relations outside of marriage.
Do LGBT folks always get treated fairly by Christians? No. We all fall short of the ideal that Jesus Christ set for us.
As a Christian, I don't condemn anyone but myself, but neither do I support immoral sexual behavior.