Okay Boomers. 
Seriously, have you blokes been self-isolating for the past 30 years? In 2016 there were 296,000 women working in construction in the UK, according to the Office of National Stats. Still a small minority overall but hardly a new or strange thing. It's been going on since the 70s. It's nothing new and it's nothing particularly unusual any more.
As for "men are stronger". Tosh. Men are on average larger and therefore have on average greater muscular power. But reckon you are stronger and tougher? Try childbirth for starters. And yeah, men traditionally went out hunting, ie goofing off in a bunch all day long to come back with a couple animals they speared for fun, while the women did all the hard work of planting, digging, weeding, harvesting, threshing, winnowing, gathering, grinding, cooking, cleaning, child birthing, child raising, basket weaving, cloth weaving, string making, rope making, clothes making, and pretty much doing everything to keep everyone alive bar spearing a couple of deer a day per tribe.
And "everything is invented by men"??????? What rock have you been living under all your life? That statement is so ludicrous it does not even rate an answer. Trolling or what? Surely you can't really be that out of touch, can you?
"If they, the ladies that is, want equal parity with men, then they should be seen to be doing the unpleasant, hard jobs as well as the nice boardroom jobs. " — You mean like childbirth, cleaning the toilets, cooking, etc etc? Or working in the chicken factory, garment industry sweatshops, restaurants, dry cleaners, hospitals, schools etc etc etc?
You guys need to get out more. 
Edited By Hopper on 22/03/2020 12:36:56