I would say that this is true because every article/news source that I look at says something about the slump of sales and backlash against the Tesla brand has been outcome of Elon's political involvement. Because of our political state, and because of how much Elon has associated/tied himself to Trump's political campaign, he, like Trump, is disliked by much of the population. This isn't to say that Harris wasn't also disliked, I'm simply pointing out how drastic and hateful our political standpoints in America has become from all parties. I looked at several articles the most prevalent being CNN, The New York Times, and ABC articles. The article from CNN states Musk has, "in recent years, defended racist tirades and agreed with antisemitic statements. Also, Tesla removed support for diversity and inclusion from its financial reports while X, as Musk renamed Twitter after buying it, re-instated the accounts of avowed racists." So this may be up for interpretation as most everything is, but I can understand why Elon has created such a controversial and negative attention around himself. An article by ABC news discusses the recent events of arson and vandalism attacks against Tesla vehicles. ABC points out how the White House weighed in on the attacks with Press Secretary Caroline Leavitt stating, "Democrats were big supporters of Tesla and of electric vehicles until Elon Musk decided to vote for Donald Trump. So we would like Democrats to also come out and condemn this heinous violence that we have seen." So as you can see, a lot of people are angry at Elon and his actions/involvement with our recent 2024 Presidential Campaign. However, New York Times also provides some other possibilities as to why Tesla sales are crashing as it could have been, "due to buyers who are waiting for an upgraded version of the Model Y, analysts said. Deliveries of that version began in March in Norway, which perhaps explains why the company’s sales last month were down only 1 percent from March 2024." NYT also explained that other traditional car makers have caught up to Tesla's technology, and no Tesla has competitors such as Volkswagen, Volvo, and BMW that also offer a diverse selection of electric cars. I could see how the answer to this claim could be up to your interpretation and thoughts/feelings on Elon but to me it seems decently clear that his actions sparked aggression.
https://www.cnn.com/2024/04/07/business/tesla-ev-sales-slowdown-stock/index.html
https://abcnews.go.com/US/tesla-vehicles-vandalized-us-musk-began-white-house/story?id=119910817
https://www.nytimes.com/2025/04/02/business/tesla-sales-elon-musk.html