I normally always slow, ask and if needs be I stop and help. Lately, I have ignored a couple of guys who appeared to be standing at the side of the road, looking at their bike.
I have asked a lady if she needed help, whilst moving, but she said she was OK, so there you go, a bit of sexism if you like.
To be honest, if I was in their position, I'd rather people didn't stop. I carry all the tools to do all the jobs that can be realistically done at the side of the road.
If other people don't, well, they should really look at Zwift as a viable option...