I've taken up sewing in the last 2 yrs, I do it purely as a hobby and a way to relax.
Over that time I've made various clothes (dresses, skirts, jumpsuits etc) for both dc and myself. I've been lucky enough to have lots of positive feedback about them and have made the odd gift. Along with the clothes I've made other items too.
I've posted some items on FB showing pics of my dc wearing them occasionally and just kept an album of various things.
I made my dc an item of clothing this weekend and put a pic on Facebook. A friend has left a really lovely comment and asked what I would charge for similar for her dc. I left a comment saying as it's only a hobby for me, then all I ask is she pays for the materials.
I then get a quite abrupt message from a an acquaintance who has just gone into business for herself as a professional seamstress, she has said "People like me are the reason she is finding it hard to make a living" as by friends paying a reduced price from me are undercutting her 
I can see her point to a degree but surely what I charge a good friend is between her and myself suirely ?