Why does Gemma not attack but befriend Tiff as she attacks John ?
 

The reason Gemma doesn't attack Tiff for doing far worse than John when she made out Angie had been spreading the horrid rumour that David Guest was dead when he wasn't.

That was far worse than what John did putting Darren up.

But Gemma doesn't attack Tiff for it she instead befriends her

while at the same time attacks John every chance she gets

for a far less serious offence,which IMO was wrong,but the intentions behind it were good.

The reason she attacks John and befriends the far worse IMO Tiff

is that she perceives john as a threat to her winning the show,

probably her biggest opponent to winning prob the fave to win,cert one of them because of his huge Eastender's support.

Whereas she doesn't think Tiff is a threat to her winning and she can use Tiff's nature,

IE being stupid and fiery to vi t c h about John for her.

She is jealous of John,as he has talent,he can articulate a sentence,he is successful and has manners,I think SHE thinks he IS a threat her winning,that is why she is doing her damnest to bring him down,I don't care who wins as long as she doesn't,she is a vile person with no redeeming qualities that I can see,I hope sweaty Betty gets kicked out soon.

I agree with Kazanne...I also think she's a coward who knows John has too much respect to punch her...where Tiffany gives the impression she could

Girl code.
Sisterhood a concept well embraced by the GC so far.

Because she knows Tiffany would wipe the floor with her.