Actually, many people do recommend handling them a lot when they are young -- the pullets, that is. It can create or worsen an aggressive roo's behavior.
I had a few brown leghorns who were stand-offish but not spazzes. Not friendly though. You're much more likely to get friendly, easily tamed chickens from the more common dual purpose breeds, orps, barred rock, speckled sussex, and so forth. RIR also seem to have a high incidence of meanness.
My Sussex are by far my friendliest, and get friendlier with age. But of course they are individuals, you can get a lap leghorn and a mean buff orp, you never know.