I would assume they are protesting against the Islamic doctrine. - But they tend to focus their hatred towards the Burqa specifically, either way, does it actually make a difference? They are being hypocrites.
Of course there is a difference, protesting against the obligation of woman to use Burqa to hide their face doesn't contradict they using facial coverage (which I don't think they should, but they probably are ashamed of being seem doing it and/or afraid of being laid off) versus safety reason/recognize because that is what their coverage do.
The religious freedom vs oppresion of women is certainly a divisive situation where it's both right to say islam is antiquate but also that they are free to pursue it as long as it doesn't break any other law.
Someone wanting to use burqa is still different than being a woman that is mandated to use it not of own volition.
duduspace11 "Well, since we are estimating costs, Pokemon Red/Blue did cost Nintendo about $50m to make back in 1996"
Mr Puggsly: "Hehe, I said good profit. You said big profit. Frankly, not losing money is what I meant by good. Don't get hung up on semantics"