It all depends on the individual horse really. For example, some horses are very affectionate towards ceratain people, others are very well behaved for some people, some follow certain people everywhere, and some just don't attack certain people
I know a horse at my RS who is well behaved on the ground for me, doesn't bite me (or kick me), and will follow me everywhere, whereas other people are lucky to actually get her tacked up without being bitten or kicked at least once. She is rarely affectionate towards me (although is slightly when in a good mood), but when comparing how she trusts me and treats me differently to other people on the yard, it is obvious to most people that she likes me.
There also used to be a horse on the same yard who was a nightmare to handle in her stable, she would spin, kick out, pull the best evil faces you've ever seen, and bite as soon as you got within a metre of her. She was impossible in her stable. There were a few people on the yard that she particularly liked, she still spun in her stable with them, ocaasionally kicked out, pulled faces etc, but it wasn't quite as extreme with them as everyone else.
Depends entirely on the horse