The word is probably a phone .
1. Girls love it - girls love to talk so they love to use phones.
2. Boys use it - Boys also use it for many reasons.
3. Parents hate it - Parents hate their children using phone too much. But that does not mean they do not like phone or completely don't use it.
In other opinion, the word can be strauss. It conveys a number of meanings that each match the clues.
A boutique - girls love flowers don't they..
- boys use it for proposing girls. except that - the flower-sellers also use flowers to earn money for their living
A fight - Parents hate fights
Note: This question needs more information. It would have been better if there the no. of letters in the word was mentioned.