He thinks he has a snake in his boot whenever someone criticizes his work.
Он думает, что ему угрожает опасность всякий раз, когда кто-то критикует его работу.
Definitions
A phrase popularized by the 'Toy Story' movies, especially by the character Woody, who says 'There's a snake in my boot!' It is typically used humorously to suggest surprise, alarm, or that something unexpected or troublesome is present. Outside of the movie context, it can refer to an unforeseen problem or a hidden danger.