A man can walk into a bar/pub, sit down and have a quiet drink, but a woman would be looked at sideways (and would probably attract unwanted attention, particularly if it was in the evening). Sad, but true.
It's not true though.
In the same way that a man who is a regular at a local pub will be seen as being a sociable chap, but a woman is seen as probably having a drink problem.
I think you're projecting your own perceptions here, rather than reflecting anyone else's.
Recently, DH was out and DS2 (4) asked if I would take them for a walk and to the pub. DS1 (who is 6) announced that we couldn't go, as 'pubs are a place for men'. I guess if a 6 year old, in his limited experience, notices that pubs are a man's domain, even in the daytime, it's probably true! But actually, I couldn't take them there on my own anyway - I would feel really odd without DH, and I would feel judged. But I'm sure DH would be perfectly happy and comfortable doing this on his own with the DCs.
Yep, definitely projecting.. I am a lone parent. I take my children to the pub if I want to. Neither of them (one of each) has ever suggested that pubs are a place for me. And no one has ever reacted/responded negatively to me.