My DD has an autism diagnosis, global development delay and is non-verbal at 4. It would be to much of a risk for me personally, given her extreme vulnerability, to leave her with a random male babysitter, just to be one of the cool mum gang.
I'd even struggle to leave my NT very mature and chatty DS of 5 with this person, so it's a no from me.
I'd also not leave either of my DC with a single unknown female babysitter. They've been at nurseries with multiple carers, but I'm not comfortable with the one-on-one situation for either of them.