We are foster parents and we've had a child with sensory integration disorder. The little girl we had never liked it when her hands were dirty, messy or when she walked barefoot on the grass or sand. She received Occupational Therapy and we did the "brushing" technique and that seemed to help. She constantly wanted her hands wiped, cleaned. She didn't play much in the sand or fingerpaints either.
We've found you really have to work at it make it get better. We did more fingerpainting as a family and let her know that it is okay to get your hands messy/dirty. That we wash them later and everything is okay. We used a plastic container and put rice in it (per Therapist's suggestions) and hid toys and animals in the bottom of the container. She had to dig to find the toys and animals. That really helped her also. The preschool she was in used shaving cream and a rice table with rice in a big bowl. You can also use beans if you would rather use beans than rice.
We didn't have a big problem out in the community with her. However, she had a very mild case of sensory integration disorder.
It is a common thing with other kids to get this also. I'm sure if your child has sensory issues and they are worse than our foster child's than yeh, people might stare and look at you differently.
Kids who have special needs or issues get stares and looks from other kids and other parents. We've had a special needs child who had a muscle disorder and he required lots of therapy. He was different and couldn't do all the things that other kids could do. We dealt with all the rude and mean things other kids said to him. It was so sad to see other kids pick on him.
Hope it gets better for your child.
What kind of business do you have?