Wasn't dairy subsidies a sticking point during the NAFTA renegotiation? Hasn't US claims of softwood lumber subsidy been an issue for years at this point? It sure seems like trade deals with the US are a one way street.
Our supply management is also bad, but at least the cost is born by people who use dairy products. I would argue that the US dairy subsidies are worse as everyone is paying for it whether they like it or not.