Hard no. There is such a thing as the right to forget. At least in Europe. Stackoverflow likes to take that right away as it earns them more money, but that is never a good reason.
Right to forget can be achieved by unlinking the content from you, though, and making sure it contains no personal identifiable information. Doesn't mean it needs to be deleted.
Specifically since what you've posted on SO you've shared as CC BY-SA.
The right to forget is about removing personal information from a site, or removing articles about you from search results. An answer to a Stackoverflow question isn't really personal info.
> The right to be forgotten does not mean you content has to be taken down
As with almost anything GDPR: it really depends on the content, on the website, on the situation. There's no clear cut answer that applies to all cases.
And copyright law also enters into the picture here, which is why I added the second paragraph.
Try publishing a book with any European publisher and then "right to be forgottening" it out of existence.