This is an excellent tactic in a number of ways.
Like John suggests, it gives you space to parse the info and stop your lizard brain from fucking you up.
But it also makes sure you simply didn’t understand what the person was saying.
I still remember a conversation I had on IRC with someone that was going the wrong way down Cordiality Street.
When I felt myself getting really angry about this person’s lack of sensitivity to my situation, I called it out by saying “the way your speaking about this is coming across as really insensitive, which is really unusual for you. This makes me think it’s my interpretation of your tone rather than the tone itself.”
She stopped in her tracks.
She immediately apologised.
Potentially years of bad blood averted by having a radically candid conversation.