Independent Ontario MPP Randy Hillier seemed to tweet a picture from the service as well.
Ontario Premier Doug Ford previously called the politician "totally irresponsible."
He also said an independent MPP joining large gatherings to protest COVID-19 lockdowns is “totally inappropriate.”
The premier’s office is violating democracy by muzzling MPPs, the veteran PC said.
He said his former colleagues are committing "more egregious acts" than the Liberals did.
The conservative says the party's grievances with him are "childish."
The premier said he wanted to "run through a few things" with him.
Dozens of parents whose children have autism were at Queen's Park.
He's currently running for mayor of Brampton, Ont.
The ex-Ontario PC leader faced a complaint from a fellow MPP.