what the tweet actually said as written in your link...
""Rishi Sunak as prime minister isn't a win for Asian representation. He's a multi-millionaire who, as chancellor, cut taxes on bank profits while overseeing the biggest drop in living standards since 1956. Black, white or Asian: if you work for a living, he is not on your side.""
does not look unreasonable to me
if you think this is "nasty" then i cannot imagine what you must think about your own party