As much as I would LOVE to see Asad giving Razia and co. a royal dressing down, He cannot do so at all.
Because firstly Zoya is blamed for poisoning Razia's daughter, Any mother would get enraged for nearly killing her daughter. Secondly Zoya isn't an invited guest, she had no proper invitation to go there at all.
He is not in any position to give any reply to Razia's accusations and anger without any proof.
Unless Ayaan has invited Zoe...which wouldn't make her uninvited at all. I think Dilshie is getting blamed for poisoning the sweets and Zoe for delivering it.