I've had no experience of Genes Reunited website, but, as others have mentioned, lack of politeness is becoming more common generally these days. One Christmas a couple of years ago I composed....I dunno...essays including everything I'd found on family history during an intense spell of research. I sent, along with Christmas cards, copies of my work to two cousins, one from each side of my family, both around my own age, both of whom have offspring (I do not). I hoped that they would enjoy knowing a little about our family history, as I had, and pass the information on to their families.
I was very surprised, and quite sad, that I received not a single acknowledgement - never mind a thank you!
"Thank you" seem to be the hardest words now!