So there are 2 parts to this. The first is that bpd can make you resistant to new ideas and change. So it's good to consider other plans in your own time.

However 2 point is this guy is way overstepping. Client blaming seems to happen when therapists don't like to shown as wrong. It's dumb and it's shaming. No time for someone who shames someone for not doing as their told and having their own coping techniques.