Some places take that attitude to the extreme, and for people who just want/need to put in a standard 9-5 and get their work done, feeling forced to participate in extraneous stuff in the name of 'bonding with the team' is awkward.

edit: can't reply to jpwagner again(?): re: "forced" not appearing in the original text. Have you never felt social pressure to do something, even (especially) when someone indicated something was 'totally optional'?