My boyfriend just trolls me when we are shopping rather than being a helpful company?

Whenever me and my boyfriend goes out for shopping , he ridicules me for the choice of colour i pick or the dress i choose. maybe am in wrong to feel embarrased at his comments , coz he is just trying to bw funny... but i dont like this behaviour of this and i have told him before... he does this everytime , i wanted to get him a book and i took him to the shop and he kept loudly trolling about the book showing his disinterest... i expect him to convey his disinterest in a matured way and not like this... am i expecting too much?

My boyfriend just trolls me when we are shopping rather than being a helpful company?
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