Paul Wehage's days at the Paris Conservatory

On Paul Wehage's biography, he admits nobody liked him at the Paris Conservatory:

His years at the Paris Conservatory were not happy, due to frustration with what Wehage considered to be substandard repertoire as well as his passionate, expressive performance style which had been such a success in the United States and which was not considered to be quite right for the strict standards of Daniel Deffayet's class, with whom Paul Wehage was in frequent conflict.