I'm not defending the guy but he has liquid on his back and you can barely hear him say something which sounds like she threw shit at me.
If she threw shit at him and hit him with it... I kinda don't blame him.
If he said something nasty, racist homophobic or otherwise insulting to her and then she threw something at him, that makes it a bit more questionable on whether or not she deserved to get hit.
This needs much more context.
That being said, the dude very likely was being a prick and deserved to have shit thrown at him. Still though, if you assault someone first, don't expect to not get it back. Male vs female, male vs male, female vs female and all other things in-between, you start shit, there might be repercussions. Make sure you are prepared to handle that.
Ignoring some bigot (if he started it with words) could have potentially saved her getting her face fucked up.
I'm sure I'll get downvoted for that but my point is still 100% valid.
Edit: For the people that don't seem to understand how the world works. Try this experiment and get back to me. Go out into the city with a cup full of some random liquid (water, soda, whatever) find someone bigger than you and throw it all over them. Please report back and tell me how that worked out for you.