DP refuses to acknowledge he was partly/mostly to blame for a very minor injury I gave myself during playfighting

[LeonaTt]

Saying he didn’t push my body part X against hard surface Y (I did it because I’m clumsy..)

But it happened as I was leaping off the sofa to get away from his play fighting (at which point he was following me and was still all over me). It’s clear he played a huge part in my very minor injury but he’s being defensive and saying it was me who actually injured myself. I said I know he didn’t do it with the intention to cause harm but his actions led to the consequence - he’s much bigger than I am so not easy to wriggle away.

He seems very defensive and not apologetic at all. Almost as if it makes him appear like a woman beater or something (which was definitely not what I was implying)

Erm, if you weren't playing, then it's not play-fighting. It's not even fighting. It's just him attacking you.

Or would you be more comfortable with 'physically harassing' or some other euphemism?

Whatever, it's something he's doing to you. (Then telling you your injuries are your own fault because you're too breakable).

@LeonaTt sounds like my brother, who fiddles with and annoys his wife, pulling her hair, putting it into her ear etc. It drives her (and me) absolutely insane. If she bats his hand away and thumps her hand into the wall, he thinks it’s funny. He’s now doing it to his daughter who also loathes it. They don’t want to be fiddled with or annoyed in that way, it’s not appropriate to play fight or touch in an annoying way (in any way!) if someone does not want the contact.

it was one sided play fighting. I didn’t want to and was trying to get away from it since the minute it started.

There is no such thing as one sided play fighting. Play is the wrong word to use. Either you are both enjoying the game or it's not a game and it should stop immediately.

Attacking someone and claiming its just play while refusing to stop is actually very hostile behaviour. It's what bullies do.

It’s really the last thing I’d want to be doing but as that’s the natural dynamic people often assume ‘no get off me’ etc is all just part of the game

By "people" you must mean your husband because that is not the "natural dynamic" among most normal adults. Again, assuming that "no get off me" and trying to get away are all just part of the game is an excuse that bullies use.

he didn’t do it out of anger or to physically hurt me (more just to annoy me)

Getting physical and invading your space to annoy you is hostile behaviour.

Your husband doesn't want to admit that his image of himself as a nice loving husband isn't the reality. Nice loving husbands don't "play fight" when their partners don't want to. If he was a nice loving husband who genuinely thought you were enjoying a game he would have apologised immediately he understood that you were trying to get away and got hurt. But he didn't. So now you know for sure. He is a bully.

OP, that isn’t play fighting.
He hurt you when yo didn’t want to play fight. It was not your fault, he is not a nice person.

Point out to him that it wasn't play fighting because he knew perfectly well you weren't playing. And that it was therefore assault, and if he doesn't grown up and stop it now the consequences will be serious.

Play implies enjoyment. You weren't enjoying it. He knows that, you know he knows that. So whatever it was, it wasn't playfighting. There is aggression in it, OP - I think you know that although you may find that hard to accept right now. The fact that he is incredibly defensive shows that he knows it too.