I think the answer is : caesionid
As its meaning is confusion between two species i.e fusilier and caesio xanthonota so its related to confusion and as for the given clues
1.Girls love it because most of the girls love the guy who keep them confused..
2.Boys use it as one of the synonyms for the term confusion is mess. And boys do mess up things.
3.Parents hate it obviously.They don't like any lack of certainty which is one of the meaning of confusion.
4.Mobiles are scared of it as one of the another synonyms of the word is disorder wiz means disrupt the systematic functioning or neat arrangement of something or hence we can call it hanging of mobile phones.From which they are scared of.

So according to me as the word is related to all four of the given clues, the answer is : CAESIONID
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The correct answer is strauss which is of 7 letters.
it has meanings like bouquet,fight and it is used as first name for german boys.
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