Their feet weren’t wet...when the waters parted they went across on dry ground but they were crowded on the shore before they went. The Egyptians were being blocked by fire anyway so no one needed to have gotten their feet wet.
He said Red Sea but meant Joshua and the Jordan crossing where that did happen. Possibly?
It was an exaggeration to prove the point.
They were so close to being killed, they were freaking out.
The Israelites seemed to be trapped. Mountains stood on one side, the Red Sea in front of them. When they saw Pharaoh’s soldiers coming, they were terrified. Grumbling against God and Moses, they said they would rather be slaves again than die in the desert.
Moses answered the people, “Do not be afraid. Stand firm and you will see the deliverance the LORD will bring you today. The Egyptians you see today you will never see again. The LORD will fight for you; you need only to be still.” (Exodus 14:13-14, NIV)
The angel of God, in a pillar of cloud, stood between the people and the Egyptians, protecting the Hebrews. Then Moses stretched his hand out over the sea. The Lord caused a strong east wind to blow all night, parting the waters and turning the sea floor into dry land.
During the night, the Israelites fled through the Red Sea, a wall of water to their right and to their left. The Egyptian army charged in after them.
Watching the chariots race ahead, God threw the army into a panic, clogging their chariot wheels to slow them down.
Once the Israelites were safe on the other side, God commanded Moses to stretch out his hand again. As morning returned, the sea rolled back in, covering the Egyptian army, its chariots, and horses. Not one man survived.
After witnessing this great miracle, the people believed in the Lord and his servant Moses.
Many are no longer standing firm, waiting for the glory of God.
I reckon He notices that.