I'm thinking of ending a potential relationship because the guy in question is ignorant and cringe-worthy.
What don't  you like about him?
Let's just say I'm not a big fan of his video game commentary.
When you start a relationship, it is all about learning about each other and finding out if you like each other, so if you find out that you don't like them you can always end it. It is better than wasting your time and theirs.
That makes sense to me.
It's good for both of you that you caught this early. Better than wasting a lot of precious time.