Tennis icon Martina Navratilova has been highly critical of billionaire Elon Musk ever since his controversial takeover of Twitter. The 18-time Grand Slam champion has not been impressed by the changes to the micro-blogging site as well as reports of a hostile work environment.Navratilova recently reacted to a report suggesting that managers at Twitter are expected to identify low-performing workers, who then have four weeks to improve or be fired. "Wow. Not exactly a fun place to work… sounds pretty nasty to me. Good luck to all the remaining employees at twitter, seriously," she tweeted.Martina Navratilova@MartinaWow. Not exactly a fun place to work… sounds pretty nasty to me. Good luck to all the remaining employees at twitter, seriously. twitter.com/ZoeSchiffer/st…Zoë Schiffer@ZoeSchifferNEW: Twitter engineers have received another late night email laying out Elon Musk’s expectations. Managers are expected to “identify low performers on a regular basis.” Those employees then have “up to” 4-weeks to improve or they’re out. 1/7013NEW: Twitter engineers have received another late night email laying out Elon Musk’s expectations. Managers are expected to “identify low performers on a regular basis.” Those employees then have “up to” 4-weeks to improve or they’re out. 1/Wow. Not exactly a fun place to work… sounds pretty nasty to me. Good luck to all the remaining employees at twitter, seriously. twitter.com/ZoeSchiffer/st…Navratilova also replied to a tweet suggesting that people might punish Musk by not buying Teslas, saying you "couldn’t pay me to drive one.""Probably. Some already have. I would have bought one a while back but the styling didn’t thrill me. And now you couldn’t pay me to drive one:)" she wrote.Martina Navratilova@Martina@DylanMurphy666 Probably. Some already have. I would have bought one a while back but the styling didn’t thrill me. And now you couldn’t pay me to drive one:)1@DylanMurphy666 Probably. Some already have. I would have bought one a while back but the styling didn’t thrill me. And now you couldn’t pay me to drive one:)"I actually had to wait till I got my citizenship before I came out" - Martina NavratilovaMartina Navratilova during a women's health panel discussionDuring an interview a few years ago, Martina Navratilova revealed that she could not come out as gay before acquiring American citizenship because back then, it was a disqualifier. "I actually had to wait till I got my citizenship before I came out because back then it was a disqualifier to be gay. So I've had reporters after me for years, they were like, 'What about you?' and I said, 'I can't talk about it until I get my citizenship'," Navratilova said."I was always covering somebody else's behind by not coming out. Although I covered mine by not coming out because I wouldn't be able to become an American," she added.The American recalled the 1981 US Open as the time when she finally felt accepted, despite losing in the final to Tracy Austin."When I got my trophy, people were clapping and they kept clapping. I finally started crying because I felt accepted. For the first time, I felt like I was at home," she said.