I took partner's 2♣ overcall to be forcing, so I bid the 4-card suit that would keep bidding the lowest. Partner rebid clubs and went down by 3.
Partner asked me why I bid at all. I thought her bid was forcing and said so. We went down by 3 instead of by 2--don't know what the big deal is.
On a related note, I'm getting really really sick of being yelled at. I represent myself as a beginner and play at the "relaxed" tables. But there doesn't seem to be a safe place on BBO for a newbie to learn.