Is there a way to block a forum user so I don't see their posts (and, I'm assuming, they would not see mine)?
No you can not do this, at least not as a "member" . Feel free to Flag a post if you find it is inappropriate, spam, or the topic requires general staff attention. Note: You can always switch the Tracking of a specific post to "Muted".
I hope that helps.
There is no block feature, but you can mute/ignore the users here:
You can also adjust the settings so that not every thread you read will generate notifications.
These are my settings: