Mr. Monk Can't See a Thing - S5-E4
Continuity mistake: The firehouse's number is 53, and is seen on the various fire trucks throughout the episode. However, in an establishing shot at the opening of the episode, you can see letters for "Eng. Company 1" and "Truck Company 1" over the garage door. This is because Fire Station 1, located in Los Angeles, was utilized for filming.
Answer: Stottlemeyer was already upset after the phone call. He was trying to get "Kevin" (who would have to be a judge, but no further character information is given) to issue a restraining order with no evidence of needing one, except that Adrian Monk said she needs one. Kevin said he would need to "sleep on it." So it's clear they've been trying to provide protection and unable to get the results they need, which seems to be based on no one trusting Monk the way Stottlemeyer does. He's just angry that they failed to protect Linda despite all their work. Although it does feel like a scene was cut, or altered, from the show that shows the futile attempts to protect Linda which built up to his outrage.
Bishop73