The former Everton player appears to have been sat on his own when he was approached in the carriage by a City fan, who mocked the coach and ex-United manager David Moyes for last season's poor campaign.
The supporter filmed the encounter and can be heard saying: "Phil, congratulations last season pal. You and David Moyes worked wonders - football genius. City, City champions!"
The 37-year-old looked less than impressed and appeared to tell the City fan to move along.