I don't know you and you don't know me, so don't take this personally or the wrong way. I see you just joined this site within the past month, so I will ASSume here that you are fairly new to keeping bps. Just as you don't know me and I don't know you, you also don't know this person on youtube who posted a feeding video, nor do you know the circumstances behind the snake. You just watched a video, you felt the prey item was too small and chose to flame the poster rather than consider that there could be other factors you haven't thought about. What if this snake won't take anything larger than a rat pup? You even said that this was an adult snake with some girth, so it apparently isn't malnourished or being neglected... What makes you a bp expert with the knowledge, experience and apparently psychic ability, qualified to flame random strangers on the internet without any background information?
You'll find that in life, your attitude and the way you conduct yourself when you approach a situation like that is just as important (if not more so) than the information you're trying to communicate or educate. I'm sure that in the opinion of the youtube video guy, you're just some jerk on the internet with a bad attitude when this could have potentially been an educational experience for him had the information been presented differently.
Just something to chew on...