Unfortunately he's decided bowling was not for him.
What made Keith decide he didn't like bowling?
When I asked him, he said it sucks and it's frustrating.
Well I don't think saying it sucks is a fair assessment but it being frustrating if fine. Not liking something is normal and not everyone likes the same thing. It's good he was able to be open about it.
He should of kept it too himself.
I get that you're upset of him sharing his opinion, but people shouldn't feel that they are unable to share their opinion. I recommend that being so critical about it.