Short aggressive outbursts

Hello
First of all please excuse any language mistakes, English is not my first language.

I am posting this because I don't really have anyone in my real life that I can ask about my problem and so I hope someone on this site has some advise for me.

My step-father sometimes has very short aggressive outbursts. These happen especially when I fight with my mother about something (we both tend towards shouting) or when I am in some other way making too much noise (listening to music/ watching videos on my phone...) and don't stop after he tells me to. He shouts and gets physically aggressive, for example grabbing my arm so strongly that it hurts and ripping my phone from my hands (if that was the cause). These outbursts only last for a few seconds and usually end with either him or me leaving the room immediately. I wasn't too worried about it in the past, because he never hits me or really injuries me but I feel like it's getting worse. Today he pushed me so hard that I fell over a basket on the floor and actually got some bruises from falling on my belt. He came to me and apologized afterwards, but it didn't feel like he really understood that he had done something wrong, or at least he didn't admit it. Instead he tried to justify his behaviour by saying that my mothers and my shouting was as bad as what he had done to me. These outbursts are all the more shocking to me as he is usually very reserved and not overly emotional. I don't think he has ever been physically threatening towards my mother but I am a little worried about leaving her alone with him, as I'm going to leave for university next year and my mother doesn't work, so she doesn't get out of the house (and garden) very often.

I don't think this is really important but aside from the outbursts he is also quite dismissive of my mother and I for example often accusing us of spending the entire day in front of the computer, when we are definitely not (my mother does quite a lot around the house that we are self-renovating and takes care of our chickens and way too many plants, I have school obviously, and theater rehersals 4+ days a week). He is also quite dismissive of "weaker" groups in general. For example he seems unable to understand that there could be any reason other than lazyness as to why someone with a poor background would not be as successful as he is (he is a university professor, his father was a head physician). It often seems like he thinks that only his opinion about something (even as trivial as music) is the only right one, and everyone with a different opinion is simply wrong.

Aside from my grandfather there have never been any male adults other than him that I spend a lot of time with, so I don't really have any reference if my step-father's behaviour could be considered normal or if there is something wrong with him. But I am afraid that he might hit me one day or cause me an injury more serious than some small bruises so I decided to ask.
Please tell me if there is anything I should/can do.
Erbse

Things will probably not get better.

They'll definitely get worse.

Is there a counsellor at school you can talk to? If not, call the cops next time.

There's no reason you should put up with that.