It's amazing how indignant people get when someone calls around dinner time. They act like the caller had intruded during the holiest of holies. Or that the intrusion was forcefully imposed for which there was no recourse. It's as if the caller had peeked in on the couple having sex.
There is a simple remedy: DON'T ANSWER THE FUCKING PHONE!
This is especially true nowadays when technology has afforded us with caller ID, *69, answering machines and voice mail.
Screen your damn calls and keep eating.