Having a very poor tolerance level. The word threshold is the part of the door frame that you step over. In times gone by it was the peice of wood that went accross the doorway to stop the straw or hay (thresh) from spilling out of the house, long before carpets were used. Hence the word 'threshold'
Perhaps because of certain distinct physical differences between male and female, this term has been used to describe abilities that are more common in the male sex. Such abilities include; map reading, spatial awareness, computer programming, DIY, and mathematical ability.