Tensions boiled over at the London Stadium on Saturday as fans stormed the pitch and chanted at the board of directors.
The revelations come amid a toxic atmosphere at the club and open protest during Saturday's home defeat to Burnley, and after a senior West Ham official told The Independent they didn't know people they were meeting would be responsible for such language.
The club are in serious danger of getting relegated under David Moyes.
Sullivan was hit by a coin thrown at the directors' box, although he was not injured.
After the game club legend Sir Trevor Brooking claimed that Hammers co-owner David Sullivan was struck by a coin during the ugly scenes, while West Ham have launched an enquiry in response and have called an emergency meeting with all London Stadium shareholders on Saturday night.
"I was concerned to read the coverage about Mark's treatment in the Guardian over the weekend and have subsequently spoken to him about his experiences", Streeting wrote in a letter seen by the Guardian.
AS say the situation at West Ham was "surreal", and add that during the "madness" fans went after their own players.
And responding to a comment detailing how much Spurs will charge, Roberts took a pop at West Ham's London Stadium, which has been criticised for the distance fans are from the pitch; the London Stadium is also used for athletics.
"If you have any further queries, please do not hesitate to contact us". "A lot of fans got on the pitch", he said.
He smiled: "I just turned round and saw some kids there and thought 'I don't think they're subs!' but there was some commonsense, and there was no problem".
West Ham are 16th in the league, three points adrift of the relegation zone.
The Football Association confirmed it will request West Ham's version of events as the organisation condemned events at the scene of the London 2012 Olympics.