The hijab is symbolically associated with the lack of freedom because in some Islamic countries like Iran, it's mandatory. We know that you guys choose to wear it in the UK and nobody forces you to, but you can't expect people to make claims on how liberated you are, when religion, the reason for you wearing it, is also the reason why women in the Middle East have no such choice.
Before you liberated personas jump me for discrimination against the scarf - no, I don't mind it, but looking more objectively and seeing why people would discriminate it is the bases of a more open discussion. Moreover, I don't understand why you'd think negatively of anyone suggesting that taking it off would be a good course of action. After all, the person, at least in their perception, is trying for you to get you your freedom. You have to understand that it's truly mind-blowing for an atheist Westerner how you're willingly putting yourself in a less comfortable situation, because let's be honest, not everybody appreciates hidden faces, just because of your belief. It's actually a bit strange how you choose to follow an idea that takes the right of living how you want without a severe punishment, hence the finger pointing and camouflaged attempts to help.
brb guys, gotta go ask my parents to organize a girl for me.