Just because a horse doesn't know what a treat is - how is that any reflection on it's life at the track or in training? There are plenty of polo ponies, dressage horses, show horses that have never been given treats - not sure what you are trying to imply by that statement. As far as social skills, a lot depends on the training facility. Are you refering to his interaction with other horses or his interaction with humans? Most are fine amongst other horses because they do not lead solitary lives, they are worked in pairs, they are ponied, they travel in boxes with several other horses and usually get turned out for several months per year to rest up out of season.
As far as human interaction, they probably get more than most peoples horses. We start at 6am in the morning, they have people around constantly, we take a few hours off for lunch and then they are done over for evening stables. Do your horses get about 45 minutes of individual brushing etc every single evening and then are they inspected to make sure that they are put away for the evening to the highest standard? We used to have "white" shavings beds, not one single dropping allowed, feeders and buckets scrubbed every night. Stable blankets and rugs have to be brushed off before the horse wears them. They get better care than any horses I've ever been around and that includes show horses, reiners, polo etc.
Quite frankly I'm tired of people on this board pointing the finger and making assumptions that all racehorses are treated badly and that we don't care for them properly. The real problem that occurs when they come off track is that they are bought or adopted by people that don't have a clue. They think it's cool to own an ex-racehorse and then try to mount it putting their foot in the stirrup and wonder why it goes nuts. Maybe because it has never been mounted that way? They are one sided because all tracks in this country are left handed. There are too many people that make this generalized comment that all OTTB are nuts, hot, crazy or hard to deal with and that is so not true. The problem lays with the handler and what usually happens is that they are too much horse for some people to handle, not because they are crazy or hot but because the new owner is either not an effective rider or a novice. I've been around TB racehorse charities enough to know that many horses get returned because the new owner can't cope with them. They get the horse off the track and then think they can just hop on and go for trail rides or go do dressage - sorry it doesn't work like that. Point in question - my horse had been through several adoptive homes and returned each time because he was too hot, wouldn't settle, had dumped people off. I took him, ride him about 4 times per week, no problems. I've even taken him onto a gallop and he's made no attempt to take off with me - it's not the horse, it's the rider that makes all the difference. I find the nature of your question not only ignorant but offensive - if your riding instructor doesn't understand the nature of racehorses, then perhaps she should stick to instructing and leave riding them to those capable of doing it. I've been riding them since my early teens and started galloping them for a living at 16 - they aren't that scary!
**Edit** As far as them being one sided, many exercise tracks are oval and can be ridden both ways - a lot of that depends on the trainer and also the protocol of the track. However when they are broken, they are lunged and worked on both reins, they are long reined in both directions, taught to change leads and are frequently jogged and cantered around the track clockwise. I agree with Biscuit about them having a preference just like humans. Just about every other country runs both right and left handed tracks and looking at the stats on some horses, it shows a clear preference for running one way or the other - perhaps 1 win on a left handed track and 5 running right handed. Desert Orchid was like that. Should also say that England even has a figure of 8 course - Fontwell.