Yes, I've done that. In fact, those white tipped roots are the reason that at one time I ended up with 98% of my hair pulled out. That was maybe 4-5 years ago. I quite my trich pulling about a year and a half ago. Now I pick my skin.
Anyways, back to the hair pulling... I'm not so sure that it's acne to be honest. I mean I know what you're saying about how much more intense pulling from a pimple or skin eruption can be- it's also more pleasing when you pull out the hair. But I've also pulled out many many many hairs with white tips, that were in no way coming from acne spots or pimples. Some of it is just the hair shaft, or maybe inflamed follicle.. I really don't know exactly.
I've had various fetishes related to the white tipped hairs as well:
Biting the gel bits off and eating them
Gathering a bunch together and sticking them to things (such as the mirror or a piece of paper)
Brushing them against my face to feel how "wet" they are... the wetter the better
Putting them close to magnets to see if they are magnetically charged
Sliding the gel bits off the hair shaft with my nails
I honestly think you'll do better with this if you don't think of it as a skin/acne problem. It is definitely better to think of it in terms of a pulling problem, because otherwise it can lead you to serious damage. I have a full head of hair right now, and it's very healthy, but I can still pull out many many hairs with the white tips.
One thing that could help... I'm a girl and it was soooo hard for me to do this, but I had to do it to save myself: was shave my head for a year. I would shave my head, so I couldn't pull, and then I would notice that my scalp would get inflamed in spots, and I'd want to pull SSSOOO bad from them, but just a week or two later the inflammation would go away, and I wouldn't have that urge to pull from that spot anymore. That helped me realize that I have to just wait out the "hot spots" (I call them hot spots, because they feel so hot to the touch) and if I could just wait out the hot spots, then it would go back to not annoying me. Also shaving helped me relieve the feeling of flaky skin (dandruff) that was causing me to itch so much and start pulling.
BTW, nice pic

It brings back memories. That's quite a juicy one you got there!