"The AIBU thread used a generic expression and it was clear from the OP that it was lighthearted"
So its ok because it was a joke? Isn't that the excuse that fabricant is trying to use?
"so much so that the OP became very defensive of her DP when some posters criticised him."
She backtracked just like the MP.
"This MP's tweet contained a specific threat to a named individual,"
The AIBU contain a specific threat to her DH.
"in an age where online threats and abuse towards women, particularly women in the public eye who dare to have an opinion, is rife."
I agree
"Comparing these two situations is really scraping the barrel."
It is comparing like for like, but you justify one whilst complaining about the other.
"And actually I really think we should be holding this MP to a higher standard than an anonymous MN poster."
Shouldn't we all be aiming for the higher standard?
"what hope is there that the anonymous trolls who abuse women online can ever be dealt with?"
Yes, all forms of abuse should be taken seriously.