Assume a get together where a group of friends are having chit chat over tea. Suddenly they plan to pull someone's leg together. No matter what the person in the spotlight says, people are not supporting him and teasing him playfully or in malice. This is the point where the person can use the above statement which means nobody is supporting him. Is there any other way (s)he could say it? I need both the formal and informal ways preferably with a humorous yet firm connotation.
Edit 1: I need an expression which would provide an indication to others to let you go/cut you some slack in a very friendly way like the above the expression does.