*Tracy Morgan’s standup act has long included bits about people with mental disabilities, but with the spotlight still on him from the June 3 anti-gay rant in Nashville, all of his material is suddenly on the national radar.

Returning to the stage for the first time following his apology tour, Morgan quipped: “Don’t ever mess with women who have retarded kids. Them young retarded males is strong. They’re strong like chimps.”

As previously reported, the remark at Carolines Comedy Club in New York earned him groans and shouts of “uh-oh” from the audience. He then launched a bit about hooking up with a girl he referred to as a “cripple.”

Now, the Arc, a nonprofit advocacy group that works on behalf of people with intellectual and developmental disabilities, is demanding an apology.

“Tracy Morgan should apologize immediately,” the Arc CEO Peter Berns, told E! News. “This quote is far too offensive to be excused as comedy, and it is very hurtful to people with intellectual and developmental disabilities and their families.

“Mr. Morgan has an incredibly powerful platform from which to fix this, and if he’s learned anything in the last few weeks, he can’t bomb this apology.”

There were reportedly no audience walkouts at the New York event as there had been at the Nashville show, where Morgan said he would “pull out a knife and stab” his own son if he were gay.

Those comments gained attention after audience member Kevin Rogers posted them on his Facebook page.