I'm sure a lot of it's friendly-ish competition, to some degree. Madonna is a Leo, and Lady Gaga is an Aries- the two most egotistical (but secretly VERY insecure) signs of the zodiac! (lol I should know- I'm an Aries....) I'm sure part of it is that Madonna feels threatened because Lady Gaga is getting more attention than she is and when a Leo isn't in the spotlight or someone else takes the spotlight they throw temper tantrums like little kids hahahaha. Friends and family are important to Aries and I'm sure it hurt Lady Gaga to hear that shit, okay??? and we get vengeful especially when someone betrays us.....
TBH I think we are a bad influence to Gaga, we were the ones making jokes and shadying other celebrities, if any of u dare to accuse Gaga of changing u should look in the mirrow and u´ll see who to blame