Notice in the Scripture below what God said the culture of the world would be in the last days with "ungrateful"/unthankful being one of the characteristics, and how we are instructed as God's people, to turn away from it. It has been said that there is no gray area, no in between, in being thankful or unthankful. We will be one or the other. Being thankful increases our capacity to receive from what The Lord is so freely giving! Being thankful is an act of honor for the Lord and an act of faith in Him and in His Word and promises! It is the quickest way to go from darkness and defeat to light and victory. In training ourselves to live giving thanks to God in all things, our faith will be strengthened, and we WILL see more and more and more of God's goodness in the land of the living as we grow and mature in speaking His language of faith and thanksgiving!
But understand this: In the last days terrible times will come. For men will be lovers of themselves, lovers of money, boastful, arrogant, abusive, disobedient to their parents, ungrateful, unholy, unloving, unforgiving, slanderous, without self-control, brutal, without love of good, traitorous, reckless, conceited, lovers of pleasure rather than lovers of God, having a form of godliness but denying its power. Turn away from such as these! 1 Timothy 3:1