I don't agree that testing algoritmic skills shows 'a lack of competence in the interviewing process'. Quite the opposite, but I respect your right to have this opinion so let's leave this aside.

On the other hand though, publicly calling a company 'stupid' because one does not like the way they recruit employees is more than a punch below the belt. If I don't like someone's recruitment process I don't apply for a job with them, but don't go to Hacker News and call them 'stupid'.