A point that I've repeatedly made is as follows. The last days are specifically compared to Noah's time in the Bible. The WT has interpreted this to mean that Noah preached for 40 years to warn mankind of the upcoming destruction. They refused to listen, so God brought the Flood and destroyed all but Noah and his family.
This is supposed to match up with the last days when "Jehovah's people" were chosen to warn mankind of Armageddon. But unlike Noah's time, 100 years have passed since the WT was supposedly selected. Almost 135 years have passed since the first Watchtower was published.
If the WT is some sort of modern-day Noah, then why would God have selected them to warn a group of people who would die before Armageddon ever got here? This would be like God sending me to warn you and your family that your house will burn down 130 years from now. Gee thanks, guy. A lot of good that does me.
The point here is that if you step back from it you can see the absurdity of it all without having to get into specific verses in the Bible. Their whole end-times eschatology is garbage and you can prove it without the need to get into the weeds.