Henry, 34, was on the scoresheet in Tuesday night’s 3-3 draw between the two teams – a result that prompted Black Cats chiefs to sack Simon Grayson.
Sunderland fans have been let down by their side in 2017, suffering relegation from the Premier League and making a nightmare start to life in the Championship.
Incredibly, they are yet to see a win at the Stadium of Light in this calendar year.
But Henry twisted the knife, and said: “Every time I go to Sunderland [I] think the same thing – it’s a toxic atmosphere for the home team.
“I wouldn’t want to be a player here with those fans.
“Obviously they have got high expectations, and there are a lot of clubs who feel they should be in the Premier League, but unfortunately only 20 teams can. The league tables don’t lie.
“It’s an atmosphere that doesn’t help the home team and it’s something we say as the visitors to try and use against them. You can get fans on their back.”
Billy McKinlay and Robbie Stockdale have been placed in caretaker charge, with chief executive Martin Bain on the hunt for Grayson’s replacement.
Sunderland defender John O’Shea has emerged as the favourite to take the job.
Former Middlesbrough boss Aitor Karanka and club favourite Peter Reid are also in contention.