Hates all food I started giving my baby pureed food at the advice of my pediatrician but he hates…

Hates all food

I started giving my baby pureed food at the advice of my pediatrician but he hates everything! He ate sweet potatoes the first time but then gagged and spit it all out the 2nd and 3rd time I tried. He also gagged and spit out avocado and today he spit out carrots. Is this normal? I am trying to avoid fruits initially so he doesn't get used to the sweetness but he doesn't like anything. Should I keep trying those foods?