Ooh, this is me!
I have a tendency towards this. Whenever I'm criticised by anyone, my first thought is to defend myself. I didn't even realise I was doing it, so when DP pointed it out to me early in the relationship, I didn't believe her. So I asked her to point it out when I did it.
What began as a simple "Defensive!", very quicky became more and more complex, initially changing in tone to sound like a Len Goodman "Seven!", morphing into more of a song, and finally settling on a specific set of moves known as the "Defensive Dance".
It should probably annoy the hell out of me, but the sight of DP (and DD) doing this ridiculous dance in the middle of a disagreement always reduces us to fits of giggles and takes all anger out the argument.
Oddly enough I'm significantly less defensive about stuff these days. I've learnt to take the time to think about whether I need to defend myself in this situation, or is it a justified criticism.
I wouldn't recommend it as a tactic with your partner though @Thanksforchatting ! Having a conversation about it can't hurt though. You might get him to be defensive about being defensive!