[1] De Vos's twitter account contained a video of a "Chinese virgin young boy" being sexually abused.
[8][9] Later in his undergraduate career, he joined the National Union of South African Students, the End Conscription Campaign, and the editorial board of Die Matie.
[10] Upon leaving Stellenbosch, he completed a second LLM at Columbia Law School in New York and an LLD at the University of the Western Cape.
[23][24][25] In June 2009, de Vos and Paul Ngobeni engaged in a heated debate on SAFM about the prospect of Western Cape Judge President John Hlophe's elevation to the Constitutional Court.
[26] In July 2018, de Vos wrote a blog suggesting that lawyer Dali Mpofu had behaved unethically in advancing dishonest arguments on behalf of his client Tom Moyane during the Nugent Commission.
[27] Mpofu posted a series of angry ripostes on Twitter, alleging that de Vos's piece was "defamatory, insulting & possibly racist" and threatening to sue him if he did not delete it.
[4] His sister, Anna-Marie, is a prominent advocate;[32] she was a plaintiff in Du Toit v Minister of Welfare and Population Development, an LGBT discrimination case that was heard in the Constitutional Court in 2002.
In February 2004, de Vos and his partner, a Coloured actuary named Marcus Pillay, became the first plaintiffs to enter a case in the newly established Equality Court.