I think its a kind of insult for the union to say that about Marco Polo members. I'm sure there are some bad ones but the vast majority are loyal customers who thought they were appreciated by the cabin crew - not viewed as some kind of groper! And do the female members also harass the crew as well? I certainly haven't seen anything!
It sounds to me like the union once again tries to justify its member fees by making a noise. Maybe the committee election is coming up.