I believe that not only the bed bugs but most or all bugs related to them (Hemiptera) are more resistant to insecticides than most other insects.

Where I live, in Europe, when I was young there were abundant insects of many kinds, butterflies, dragonflies, lacewings, flies, bumblebees, wasps, beetles, crickets and many others.

Now all have disappeared, but various kinds of bugs (Hemiptera) are still abundant, actually more abundant than before, when many other kinds of insects existed.