Especially when the article is an interview about a 24-year-old gay pop star. It's important for celebrities to set boundaries for the press so that their personal lives aren't exploited or attacked. So, when South African singer Troye Sivan was asked if he's a top of a bottom in an interview by a New Zealand reporter, he wasn't having it.
Asking anyone their sexual preferences, particularly when the article wasn't about sex, is violating. Some people noted that this interviewer, Matt Fistonich, who is gay himself, probably wouldn't ask a straight person which sex position they prefer. However, the article was for Express, a New Zealand LGBTQ magazine. Sivan answered Fistonich's "Top of Bottom?" question with a classy, "Ooo...definitely passing!"
Perhaps because the publication is an ally for the LGBTQ community, Fistonich assumed he was allowed to cross the line, but he also asked in the same interview if Sivan's boyfriend would be ok with him sleeping with Shawn Mendes, who is straight.