Stop being so sensitive on the subject, everyone whacks off to some form of material and there is nothing wrong with that in fact its natural. If you want to do it, as long as you're not doing it in public you're fine.
Perhaps if when you were watching a video and the person seems to quite obviously not enjoying it, then yeah look for another one of the billions of videos on the internet. If videos unsettle you this much then use another form, pictures, fanfic (if thats your thing) hell theres even this one where all you can hear are noises and people get off on that as well.
Its natural just do it.