A while ago a good friend asked how much I earn. I was taken back as I was brought up to believe you don't ask such questions. I didn't want to tell her as imagine I earn a lot more than she does and actually felt quite embarrassed. Also, I just don't consider it to be anyone else's business.
Also just moved house and lots of friends have hinted at how much house cost, although no one has asked outright. I know they could always look on Zoopla or Rightmove if they really want to find out.
AIBU to think its rude to ask these questions, or am I being a prude?