Make pingbacks respect ban

[azurelunatic]

Title
Make pingbacks respect ban

Short, concise description of the idea
Prior to posting a pingback, the pingback posting process should ponder prioritizing interpersonal prohibition. (Don't post a pingback when the pingee has banned the pinger.)

Full description of the idea
In theory, someone who has made a public post and has pingbacks turned on can get a pingback notice when someone who they have banned makes a public and pingback-enabled post linking to their post.

This is probably not such a good idea. The pingback process should, in addition to checking whether both posts are public and both posts are pingback-enabled, also check to make sure that the recipient has not banned the sender.

Please, do debate this one freely!
An ordered list of benefits

• Stop a possible avenue of abuse before it gets properly started.
• Make the effects of banning more consistent.

An ordered list of problems/issues involved

• Pingbacks are posted by the pingback bot, not the banned user, so it's not as obvious that banning would potentially block pingbacks from that party.
• Someone who is experiencing abuse via pingback can just turn off pingbacks.
• People who are apt to be experiencing abuse via pingback have probably already turned it off, so relatively few people might benefit.
• Someone might *want* to know when someone they have banned is talking about them in public.