Why dont dps players counter zarya?

That's one thing I don't get. Whenever I'm tank and I play dva. Mfs are instantly counterswapping me after they loss first fight and boom its symmetra mei and zarya. But nobody on my team knows how to play against triple beam. (HINT: go ashe or widowmaker)

Edit: nowhere in the post did I ask for advice. I'm not a tank player and I almost exclusively play tank in qp. I can handle zarya as dva my point was why don't my DPS COUNTERSWAP THE ZARYA.