What I got from Steve's post was that if you see women in the type of dress that he describes, they are more than likely to be Muslims.
But that is a different point - of course most women wearing traditional islamic dress are likely to be practicing muslims, but that doesn't mean that most muslim women wear traditional islamic dress.
He wasn't saying all Muslim women dress like that, they clearly don't.
I don't know what he said on Facebook, but what he said here could clearly be interpreted as being that most practicing muslim women wear traditional islamic dress - to quote his words, that he was asking whether he was a bigot:
'...for pointing out on Facebook that practising women dress distinctively, with a veil and their arms and legs covered'
If he made that same comment on Facebook I think it reasonable to call him out for generalising, although that wouldn't necessarily make him bigot. Being careful with language so as not to appear to be generalising is important.
PS: I don't believe you are a bigot Steven, you were just making an observation.
I also don't think that you are a bigot Steve, however your choice of wording here (and perhaps on Facebook too) may get you into hot water for appearing to generalise that most practicing muslim women wear traditional islamic dress.