Please help hiding under water bowl and not eating for almost 3 weeks.

[Bluebonnet Herp]

is that ok to do. I heard somewhere that that can lead to aggressive behavior when trying to handle your BP. My friend did that ad she became aggressive.

This appears to be something rather of a myth. Especially if you handle them and you open their enclosure besides for feeding. I don't feed outside of the enclosure for this reason. (but read on)

If he doesn't take it from you try leaving it in the cage overnight. Sometimes they just want dark and quiet.

Interesting you point this out. If OP keeps their snake in a glass display vivarium, what she can actually try is taking her BP out and putting it in a tight fitting tub with a dead rodent then placing that in a dark closet/drawer/room for a few hours. I got the idea after reading Justin Kobylka's Psychology of Problem Feeders and needless to say, ended a fast this way. This should really be the only reason to feed outside of an enclosure; not because of aggression concerns.
If the snake is kept in tubs or in a rack system, it's as easy as switching tubs like the article recommends.