He's extremely friendly when he runs into the visitng Sloanes, willing to catch up and to exert some influence to help Tom get into the college -- "not that you'll need it!", he chortles. When Kay says they need to check other colleges at Boston, Bill jokes "there are other schools?". In contrast, he ignores Daria except for a brief "hello" when he's reminded she's sitting there. Kay assumes that he'll put in a good word for Daria too, which the cynic doesn't believe (this scene was deleted from the DVD) and as far as we can tell, he never did.
He arranges for a breakfast date but turns out half an hour late, apologising that "I just couldn't get my publisher off the phone". This causes the knock-on effect that means Daria doesn't see much of Raft College.