I’m a big critic of both H&M but I just cannot believe the . . . story, no way did that happen
I don't think anyone can state, with certainty, what did or did not happen, other than the parties who were present at the time.
I can't believe M (rest of sentence redacted). Not her style at all. . . TBH, I can't imagine M snapping either. She wouldn't have let her image of being lovely and sweet and even-tempered and kind crack before she had that ring on her finger. . . she's not direct.
You don't know her style, unless you know her personally.
As I've posted previously, I know someone who worked on Suits. That person was very positive in comments about everyone but MM. Didn't say anything overtly negative, just hinted around the edges, but there was zero positive, either. That person is very "politically correct", although I'm certain at some point, I'll get their true feelings.
I also know someone who worked with her on the Reitmans ads in Toronto. He's an award winner who's done a significant amount of work in both Canada and the US. He did say negative things about her, including that she is the meanest person he's ever met.
I can't say anything about MM's character or temperament, but I would not put anything past anyone, and particularly not a bride in the midst of her wedding preparations (not suggesting she was a bridezilla, just that it is a possibility).