Been there, done that. I have had numerous jobs over the years and as my training would progress on various software applications and/or on a new piece of equipment the people I had to work with would vary on their temperament and often I was stuck with someone for a day or weeks who would complain and act childish in the way I was absorbing the training.

Makes for a long day for some and turns into self hate and loathing for us depressive types.