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It has long been considered common courtesy here to ping someone if one is talking about him or her in a post.
I kinda ignore that "courtesy" when quoting J.R. (like I'm doing in this reply) I quote him frequently, giving him credit, and figure it's more courteous to not ping him every time. If I ever quote him about something I disagree with, I'll be sure to ping him.
The man probably gets hundreds of pings daily and that's a lot to try to keep up with.