This same comment is made every single time there's a discussion of gender equality in tech, and when examined betrays the entire "anti gender equality" narrative.
People are in fact pushing for women in every single one of the fields you mentioned:
Construction: http://www.nawic.org/nawic/NFSFScholarships.asp
Plumbing: https://www.aspe.org/WOA
Welding: https://app.aws.org/foundation/scholarships/air_products
The next point that's brought up is "well then why aren't people pushing for more men in female dominated industries." To which the answer is, they are, and have been for a long time: http://www.aamn.org/about-us/scholarships
It seems fishy to me when people are willing to speak out against diversity in tech without bothering to research any part of their argument.