At my last offfice job the programmers doing graphics/OpenGL stuff got way more respect than the web developers.
If your boss thinks his/her adolescent nephew can do your job, then he probably doesn't understand it and views it as a low skill position.
A lot of people that don't know what you do will assume it's simple enough.
It's just not worth their time. That's why they never learned to do it.
For instance, I used to think sales and marketing were easy until I had to do it.
At my last offfice job the programmers doing graphics/OpenGL stuff got way more respect than the web developers.