Do y'all honestly believe Britney wrote that tweet 'herself'?
She's always been a humble Louisiana girl and I think it was her management who wrote that (and 98% of other tweets). There must be something going on behind the scenes between Iggy and Britney's management team for them to come back with that reaction. Even at the start of the PG "era" you can tell not everything is going as smoothly -- remember the controversy around the FEAT vs "&" on the single cover?
Anyway, It was a clever way to shut the negativity towards Brit and her team recently (no matter how true it is) and that double entendre is a 20/10.