Despite what /u/rliant1864 says, it wasn't just the jokes. That Jefferson posted so many unmarked spoilers in spoiler free threads. He was warned multiple times by mods and others. It's a ban that's been coming a long time. To copy and paste it from another discussion:

It seems every time someone in the community stirs up drama, there ends up being a lot of confusion and misleading information leading to the whole "The mods are nazis!" thing.

Let me clear up some of that confusion:

This is a temporary ban that will only last 3 days. They were banned for multiple reasons, including repeatedly aggressive behavior, excessive role-playing often leading to discussion getting derailed and going off-topic, as well as several instances of missing spoiler tags in comments despite being reminded about the rules multiple times.

I don't know if /u/mark__jefferson just told you they got banned for rape-jokes or if you decided to cherry-pick the information you included in your post, but it makes me sad that one of you decided to spread misleading information.

We won't ever ban someone simply because we disagree with their opinion or because they make a light hearted joke. Severe or several rule infractions will lead to a ban however.