Trying to date with an autistic kid and should I be concerned about him

I have a son with autism and my new boyfriend really wants to meet him. My brother did some digging into the guy I'm dating and found out it seems he only has dated women who have kids with special needs. My brother found his old Facebook and every new relationship he posted about the kid saying I love my autistic/down syndrome/ some type of special needs step kid and just super quickly take on the fathering role. And it's always a woman with a special needs child. Is that red flaggy?