Many years ago my sister rescued a greyhound. When she first got her, Maggie had no hair on her rear end. This was from being locked up in a kennel all the time. She also did not like men. It took her a few months to totally be comfortable with my dad and brother.
Bald thighs also occurs in non reacing greyhound who are raised as pets and not crated and also in some line of whippets, Medical researcher have been trying to explain for years and still have no answer as to why it occurs, and has nothing to do with crate rub. Some will arrived fully haired off the track and a year or 2 later will have bald thighs, it appears to be genetic.

As for not liking men, it is probably because she was rarely exposed to men, the greater number of greyhound trainers are female, so often the only male a greyhound will have contact with is the state vet ( so not surprising they may feel a little wary of men if that is their only exposure.

When greyhound goes from track to a home, it would be like us taking a young child from it's family and home in North America and throwing it in with aboriginals in the jungles of Bornea, where absolutely nothing is familiar. If you were a child placed in that position how would you react? and how long do you think it would take you to adjust to a totally different lifestyle with totally new expectations of you? to me I view it as amazing that they can become comfortable and relaxed in only a couple months considering what a huge transition a pet life is for them