User blog comment:Looperreallyreallysucks/Pure Evil Discussion - Avengers: Endgame/@comment-29414935-20190513140654/@comment-25075214-20190513163521

That was in Infinity War. This is Endgame that we're talking about. 2014!Thanos learned about his future self's successful plot and fate, and the fact that no one praised his actions because they lost their loved ones due to them. But rather than admitting that he was wrong about his methods of balance, he instead decided to change all of it by travelling to the present so that he can use the Stones to wipe out the entire universe and recreate it in his own image so that no one will ever find out. Sounds kinda petty, even the 2014!Gamora scoffs at this turn of revelations. He also abandoned whatever respect he had towards the Avengers by calling them unruly wretches, even planning to destroy the Earth out of spite against them.

As anyone can see, the Thanos from Endgame was a very different person from that of Infinity War.