genuine question. do Posh sing about us when they aren't playing us?
No. Maybe they used to see us are their main rivals but not anymore.
Below is a link to all (95) of their chants. There are 4 or 5 aimed at Cambridge, 2 or 3 aimed at MK but none (that I could find) aimed at us...
https://www.fanchants.com/football-team/peterborough-united/