Comment by bee_rider
Even if you had managed to come up with a point by selectively quoting the post, that would still be bad. The good-faith way to engage with somebody’s post is to reply to the meaning of the overall post. It might be necessary to cut some parts out for logical flow, but that shouldn’t change the meaning of what you are replying to.
Attacking a point by attacking its supporting points is a pretty standard way of going about arguing.