Another tweet condemned by Mr Marsan earlier this week described the series as “excellent” but criticised the actor and his co-star Tracy-Ann Oberman’s involvement in it.
Both have been outspoken critics of former Labour leader Jeremy Corbyn’s handling of antisemitism allegations in the party.
It “just leaves a bitter taste in the mouth knowing their work on Twitter throwing fake antisemitism around to stop a life long anti - racist Jeremy Corbyn & legitimizing [sic] Palestine,” the user wrote.
Karen Pollock, chief executive of the Holocaust Educational Trust, joined others in extending her sympathy, calling Mr Marsan a hero.
“It’s shocking, disgusting, exhausting all at once,” Ms Pollock wrote.
EastEnders actor Gary Webster also waded in, writing: “Dont [sic] let them grind you down. You are an exceptional actor and a top person. Enough Said!"