It's easy. Some people are looking for reasons to reject God and justify their rejection of God.
If they can convince themselves or portray themselves, as morally superior to God, they judge Him by the arbitrary standards or *right* and *wrong* which they've established, which not surprisingly but still hypocritically, reflect the Judeo-Christian world view, the world view built on the God they reject, they can then justify their rejection of God as Him not being good enough.
After all, who would want to worship a God who was morally inferior to them.
And in that sense, they are right. Problem is, the God they're rejecting is not the real God at all, but a construct of their vain imaginings set up so they can reject the real God.
All the atheists who reject God need to take a good hard look at the real one, not the decoy set up by Satan to deceive them. FWIW, I reject what atheists portray as God as well, and don't blame them as all for rejecting their concept of Him.
People tend to create a god, stick him a box they've made and then criticize how small he is. Doesn't work for me either. :-)