Is Curley of Steinbeck's Of Mice and Men lonely or isolated?please give the evidence from section 3

Curley is isolated from the ranchhands since he is the son
of the boss in Steinbeck's Of Mice and Men.  But, this
isolation evolves into alienation as Curley, in his separateness from the others,
becomes extremely aggressive, challenging the men of the bunkhouse when he enters it. 
He is also insecure about his small stature and about his wife, who is no longer content
to sit at home.  So, to disguise his feelings of inadequacy, he bursts into the
bunkhouse, demanding if any of the workers have seen his wife, looking threateningly
about the room.  When he confronts Slim, Curley is rebuffed; the well-respected Slim
tells him to "lay offa me."

That Curley is alienated from
the others is clearly evident when Carlson and even old Candy join the verbal attack
initiated by Slim.  But, when Lennie smiles in enjoyment, Curley spots a potential
victim on whom he can unleash his bitter feelings of alienation, and he begins to punch
Lennie.  Then, as Lennie offers no resistance, the cowardly Curley continues to
punch Lennie so that he can seem to have overpowered the big man, just as Candy had told
George earlier that he would try to do given a chance.  With George's command, however,
Lennie reduces Curley to a wimpering victim himself and reverses the situation.  Now,
Curley has become even more alienated from the men and lonely since with this incident
the men perceive him as cowardly to have attacked Lennie, as well as weak. When she
learns of the incident, Curley's wife, too, ridicules him as a loser. And, with the
ridicule of his wife, Curley has no one on his side, so he is desperately
lonely.