Were I less afraid of the hamlettes that travel on my means of public transport I would love to do that.  Have seen the accidental incidents though. It tends to be well intending men trying to show chivalry isn't actually dead. Inevitably ends up being some poor man going red as some monstrosity verbally castrates him for trying to be a gent and instead ends up cast as being "sizest bastards" or "misogynistic f**kers".  It would be glorious to see one of these well meaning men retort with your comment.  I might be called as a witness at the murder trial though.