I'm not interested in working with this potential advisor. What to tell him? Or should I reconsider? I met with a potential supervisor and initially he was nice and helpful. Although he tried to make me alter my thesis, something I wasn’t keen on because I love and breath the topic. He told me to go and read more. I have done enough reading about the topic and it’s time to set the topic then read more about it to unfold it further. I wanted his consent on the topic at least before I invest more time reading in case he rejects everything.
I left with loose conclusion, not sure about his impression about me, the topic or if he’s interested to supervise me. 

I saw him in a mutual class the next day and he was hostile about my research questions. He made me feel so stupid and worthless. Is this a normal behavior of PhD supervisors? 

What should I do?
Is it polite to cut ties? What’s the protocol in this situation? 
I don’t want him to be my supervisor, he doesn’t seem patient at all.
Given that the supervisor has more experience than you, it may be best to follow his advice. Don't let ego get in the way of improving your work. 

I wonder if your second interaction as described might be the result of his feeling that you were rejecting his advice without considering it. 

On the other hand, it is good to have an advisor you are comfortable with. Whether it is possible or dangerous to change supervisors depends on the particulars of your institution. Since you say "potential supervisor" it would be a good time to evaluate your options. 

But in general, once you have an advisor, it is good to take their advice, for strategic reasons if no other. You want to finish successfully in a reasonable amount of time with good recommendations. Fighting with your supervisor achieves none of that.