You're missing the point. I don't know the OP's particular situation, but constructive dismissal can be very relevant when someone is pushed out of a job where

You're missing the point. I don't know the OP's particular situation, but constructive dismissal can be very relevant when someone is pushed out of a job where they would otherwise be expensive (e.g. severance) to terminate. This is what constructive dismissal laws are in place to prevent. In either case, as you say, the right thing to do is quit, but the OP should be aware of the laws in their jurisdiction, in case they have a case worth pursuing.