Things between Hotch and Reid had been complicated. Your job as the team's psychological supervisor and counselor required you to fix it. After a few private meetings with Spencer and observations during cases, you come up with solutions.
You called Hotch to your office and re-mentioned the issue. He was clearly impatient and just suggested giving Reid some time off. That was it for you. Time to bring the big guns.
"Not only the workflow has been affected, but also the psychological state of at least two agents. Those being you and Reid"
He tried to argue but you didn't give him a chance. He sat through your explanation of why the situation must be solved.
"If we can't come up with an agreement to fix this, I'll be under the obligation to solve it myself. I spoke to Spencer about it. If you can't seem to be more empathetic on his side, then your unit might not be the most suitable for Reid."