Posted: Today at 08:26
No it's not. Talking to someone isn't rude. Ignoring them is. If you don't want to talk to someone just tell them politely that you want to read your book.
Ooh, that happened to me once in a French park.
Me: actually, I'm really sorry, but I'd like to read my book.
Sleazy French man: that's really interesting. I'm an author, actually...
In the end I couldn't shake him off and just had to get up and leave.