We complain often. If you are not sure whether you do, listen to yourself. It might surprise you.
Israel complained and the Bible says,
Also Moses said,
“This shall be seen when the Lord gives you meat to eat in the evening, and in the morning bread to the full; for the Lord hears your complaints which you make against Him. And what are we? Your complaints are not against us but against the Lord” (Exodus 16:8).
The Lord then gave them much more than they wanted, and they did not like it. Moreover, they complained against Moses and Aaron, but they were only servants, carrying out the wishes of their Master, the God of heaven.