That is a false believe, a BP wont become cage agressive because it thinks its feeding time all the time. In the contrary, when your BP grows up and its personality develops a bit more, it might become aggressive when you try to remove it to feed it, they dont like that, or it will go off feed. Either way, is a lose-lose situation.
I wouldnt consider random videos in Youtube to be very constructive... Most of them are missleading.
If you are follow things that people do in youtube, make sure it is something constructive first.... The people here are very helpful and always trying to help out, If you lend them an ear, you will learn ALOT about BPs.