I'm not down on his idea of eating lunch together - it's probably fun and productive. But if someone spots me eating lunch by myself while reading (a book, a magazine, on my phone, on my computer), it's not because I "don't like people," or, sadder, that I pretend not to like people because I've been rejected socially. It's because I find dealing with people all day somewhat wearying and I enjoy having time to myself doing things that I like, such as catching up on reading I can't do during work hours.