I've come across quite a few people who try to befriend me while I'm in the middle of battling or just before I select which one of my ships I wish to board. In which I've clicked that stupid accept button so many times by accident. Sometimes I've forgotten to get rid of those people and that person must of been one of them!!
That'll teach me! I sat and made sure to remove anyone I didn't want on my list! I do think a walk the plank option would be neato though!