a rude observer的用法和样例：
- Her insult stung him into making a rude reply.
- I had a rude awakening when I found myself on the verge of bankruptcy.
- He made a rude sign by way of retort.
- Her request for a donation met with a rude repulse.
- I had a rude comment on the tip of my tongue, but I decided not to say it.
- He thrust past me in a rude way.