Moving through friendly occupied squares

[The Diplomat]

Two of my players have claimed that moving through friendly occupied squares counts as difficult terrain, but I can't find anything in the rules to support this. Furthermore, every game of PFS I've played has treated friendly occupied squares as normal terrain. What is the ruling on this?

Also, does moving through friendly occupied squares provide cover against AoO?

[Oladon]

They seem to be confusing these two rules:

PRD: Combat wrote:

Friend: You can move through a square occupied by a friendly character, unless you are charging. When you move through a square occupied by a friendly character, that character doesn't provide you with cover.

Opponent: You can't move through a square occupied by an opponent unless the opponent is helpless. You can move through a square occupied by a helpless opponent without penalty. Some creatures, particularly very large ones, may present an obstacle even when helpless. In such cases, each square you move through counts as 2 squares.