Being right shouldn't be something objectionable, or am I wrong? We don't need to discuss that being right and getting justice are not the same.
thinks otherwise. You believe you know things and are right, which, as one can read in the screed topic, is not the case. A polystyrene carrier for a tub is not mandatory, and screed with underfloor heating is not a no-go. If your preferred installation method had been important to you, you should have told the screed layer that the screed needed to be stopped. But for that, you would have had to inform him of the size of the tub and up to where the screed should be stopped.