Here is one of my favorite experiments. Fill a plastic bowel with water. Put it in the freezer and freeze the bowel of water. Take the frozen bowl of water out of the freezer and put it into a pan. After the ice in the bowl returns to liquid, measure how much water overflowed into the pan. Answer is none.
This proves that rising sea levels due to melting ice is b.s.
They would counter with this experiment:
1. Place a couple of bricks in a 13x9 pan and place the pan on a cookie sheet (with an edge that will catch water)
2. Fill the pan with water up to the brim
3. Put ice cubes on the bricks (as many as will fit)
4. Allow the ice cubes to melt and see how much water ends up in the cookie sheet. (I’m sure some will)
Their theory is still BS (especially the anthropogenic part), but your experiment didn’t accurately model their BS theory.