I had a couple of experiences on my last MSC cruise that still stays with me.
Although we were in the Yacht Club we wanted to see what the rest of the ship was like. DH and I were walking through the buffet and I felt someone elbow me. I looked down at this little man (he came to my shoulder) and he looked back at me with such hate in his eyes. I have no idea what he thought I did to him, but I can still see his face.
Another time we were at that club at the back of the ship (name escapes me now). We were at a table and another woman joined us. She got up to dance, had a drink and her purse still at the table and some man came over to take her chair. "That chair is taken, she's dancing" said I. "Well, she's not sittting in it now, is she?" he replied. I grabbed the chair from him. He did let it go and went on to grab someone else's chair, I suppose.
We'll still go on MSC. But only in the Yacht Club. And now I'm re-thinking booking a last minute cruise in July. Cannot deal with out of control kids, the adults are bad enough!