Calling people that wear one letterboxes and bank robbers is yet another

The comments were about how people looked. Boris didn't describe people as letterboxes and bank robbers.
For the benefit of those who haven't read the original (I accept that some have) here are the two passages:

If you tell me that the burka is oppressive, then I am with you. If you say that it is weird and bullying to expect women to cover their faces, then I totally agree – and I would add that I can find no scriptural authority for the practice in the Koran. I would go further and say that it is absolutely ridiculous that people should choose to go around looking like letter boxes; and I thoroughly dislike any attempt by any – invariably male – government to encourage such demonstrations of “modesty”, notably the extraordinary exhortations of President Ramzan Kadyrov of Chechnya, who has told the men of his country to splat their women with paintballs if they fail to cover their heads.

And:

If a constituent came to my MP’s surgery with her face obscured, I should feel fully entitled – like Jack Straw – to ask her to remove it so that I could talk to her properly. If a female student turned up at school or at a university lecture looking like a bank robber then ditto: those in authority should be allowed to converse openly with those that they are being asked to instruct. As for individual businesses or branches of government – they should of course be able to enforce a dress code that enables their employees to interact with customers; and that means human beings must be able to see each other’s faces and read their expressions. It’s how we work.

All that seems to me to be sensible. But such restrictions are not quite the same as telling a free-born adult woman what she may or may not wear, in a public place, when she is simply minding her own business.