A common thread in this for me (I haven't bumped into any famous people, nor have they chosen to bump into me) seems to be that if they were old enough to have either worked the clubs, working-mans or other, or else done the regional theaters, then they probably know how to be 'real' to ordinary joe's, because quite a lot of the time, they shared a bathroom with them. And after all, if your bottom warms the bog seat for their holy rear, they can't exactly ice you off, can they?
but if they are a product of the post WWII glamour driven society, then a front was all part of the sell. you either work the crowd nicely, or else p*ss them off totally. The Goons used to rehearse their act in the west end pubs, so my parents recall seeing snippets of the show and sharing pints. I doubt if peter sellers took brit ekland in for a swift mild and bitter.
lots of big-name comedy actors were in the 'unity' theatre movement, an inter-war socialist realist drama group.
Unity Theatre, London - Wikipedia, the free encyclopedia and again, you weren't going to be a twit with the public if you were in that community.
I'm told that people like Bill Oddie, who has a completely 'other' life as a twitcher, are fine if you talk birds, cos on that score, you're all equals. So, if you are into sado-masochistic golf in wetsuits, as long as you only ask the freakout star about their choice of wetsuit whilst on the course, you'll be fine. but if you try to get back inside the mind of the drama queen, all bets are off. Seems fair to me. I don't mind talking shop with my shop-assitants, but I don't need to do it with strangers.