I don't know why people have such an issue with it. Generally it's because their picture of God is waaay off from how the Bible describes. God is loving, but God also hates.

All their wickedness is in Gilgal: for there I hated them: for the wickedness of their doings I will drive them out of mine house, I will love them no more: all their princes are revolters. (Hosea 9:15)

As it is written, Jacob have I loved, but Esau have I hated. (Romans 9:11)

God gets angry

Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry: For which things' sake the wrath of God cometh on the children of disobedience (Colossians 3:5-6)

And when [Jesus] had looked round about on them with anger, being grieved for the hardness of their hearts, he saith unto the man, Stretch forth thine hand. And he stretched it out: and his hand was restored whole as the other. (Mark 3:5)

God does evil.

I form the light, and create darkness: I make peace, and create evil: I the LORD do all these things. (Isaiah 45:7)

And God saw their works, that they turned from their evil way; and God repented of the evil, that he had said that he would do unto them; and he did it not. (Jonah 3:10)

Most Christians would be pretty surprised if you pointed this out to them though. They eat up the televangelists' "Love everyone, we're all God's children" nonsense when the bible says that we are NOT all God's children. Only those who choose to believe.

He that believeth on the Son hath everlasting life: and he that believeth not the Son shall not see life; but the wrath of God abideth on him. (John 3:36)

He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God. (John 3:18)