I personally completely disagree with this author. I was single for seven years of watching my friends get married and have babies and instead of being bitter and envious of them I was happy for their happy life moments and couldn't wait for my own.
And that's not to say that EVERYONE has to get married and have children. I simply knew I wanted that out of life. I think if you are single celebrate you! But not the pity parties she suggests such as 10 years single and looking or 25 deleted dating app failures. How about a housewarming party? A work promotion celebration? A huge birthday event?
This resonated with me on a very negative level (as a person who's absolutely been there and thought I'd be forever single) but I never felt the need to begrudge other's happiness. It just struck me the wrong way. Curious how others feel about it! Those are only my thoughts!