The rumour was that Gillhaus wasn't on the team bus but driving down in a sports car with a friend. This upset the Rangers minded Unionists in the squad like McLeish, Bett and Wright whilst the Dutch liberals and some politically left wing guys like Bobby Connor and Eoin Jess (interesting case) took exception to this.
However, not that it matters, but Gillhaus probably wasn't gay. The same stuff circulated about Heikkinen (married with kids now) and GMS (nobody knows). The more lighter footed, skillful players are always liable to this at Aberdeen.