No Pentaz, I am not proving that Croats are Serbs, on the contrary I am defending my Serbian heritage from being hijacked by ethnicities that would like to present it as their own. It is my patriotic duty to fight against that. Croats are Croats, and should stay like that, I am not proving them as Serbs for they aren't Serbs. After the 90's I do not know what devil got into your head to look for 'more heritage' which you could write down as your own, I explain it with new nation > new history, but every time you put just a single piece of our own, down into your history books, and label it as 'Croat' you will get the reaction you are seeing.
No nation would tolerate that, especially not the Serbs. For you are not Serbs, and by that are not allowed to take or share a slightest part of our heritage.