The snake is this person's property, whether you like it or not. Taking it without permission is stealing and it's not a good idea to be telling someone to steal something in the public forum. If this continues, the thread will be locked for promoting an illegal activity.

You can be responsible and simply talk to this person. Where did the ability to communicate go? You can suggest some changes, ask if they feel that they can't care for the snake if they would like you to adopt it, etc. It does not have to be confrontational, think educational. If you try and this person does not care, then you may want to consider other options - but stealing someone's snake is NOT one of them that I'd ever consider or advise anyone to consider.