In Leviticus 19, God said, "You shall love your neighbor as yourself." In Leviticus 20, He said "If a man lies with a male as with a woman, both of them have committed an abomination; they shall surely be put to death."
There is no contradiction. Love means doing what's best for people. It means refusing to tolerate behaviors that destroy the community & its relationship with God.
Celebrating spiritual disease is cowardly. It's an excuse to avoid speaking the hard truth that homosexuality is perverse rot. It's death. Love doesn't see a person committing suicide and say, "Oh, how sweet! Love wins." What vile filth has infected people's souls that they could possibly entertain such things?
No, love says to the man drinking poison, "Stop! No more!"
This is love by God's standard, the only standard that matters: "You shall therefore keep all my statutes and all my rules and do them." (Lev 20:22a)