Being מושך בערלתו is quite a drastic step. Not doing do doesn’t prove you’re happy with the מילה.
I’ll give you an example. You go to buy a used car. You find one that’s affordable to you, large enough for your family, and the model you want, with low mileage.
The only problem is, it’s green, and you really don’t like green.
You’ve checked four dealers, and nobody else has the model you want with the other factors that make you want this one. So you go ahead and buy it. It doesn’t prove that you like green, it just proves that you don’t hate it enough to spend the extra effort, time and/or money to find the car you want in a different color.