Oh I so,so sympathise with you and Creed 
All my life I have been brought up with boxers and have gone through this with my friends and now my daughters friends. I do try to see it from both sides and if some child is terrified of dogs then I feel it's best that the parent are there when the child is first introduced to the dog. I sometimes forget just how boisterous and big our boxers are and it's not just children who are scared, many of my adult friends have been too.
When my daughter was 5 we had a small terrier who adored children. However, one of my daughters friends would only come to our house when I left Owain with my sister. I accepted that this little girl was petrified of dogs but at the same time didn't want to confine Owain to just one room while she was here. At the same time I didn't feel it was my job to try and convince her that Owain was a loving dog, I'm sure her parents would have had more success at this than me at the time. The friendship continued and as she grew older she eventually accepted Owain but to this day I don't think she really likes dogs.
I must say now Harriets friends are older (14) Monty doesn't go anywhere and they either accept him or stay at home. To his credit he is not a jumpy Boxer and if people ignore him he settles down pretty quickly. But I do see that pitiful look too and my heart bleeds for him.
They only want to play don't they?