This is exactly what the catholic right do when talking about gay marrage or homosexuality in general.
When debating gay marriage the catholic argument against it was not just that it goes against the bible but that if we as a society agree on gay marriage then where does the line stop ? And thus these scum bag minsters would go on to talk about people marrying animals or marrying young boys etc. Yet they would say no we are not being homophobic but simply talking ultimately about the sanctity of marriage.
In fact this is the US Republican go to method of politics
.Health care for everyone = Venezula
.Not locking up immigrate children in cages = MS13 in the suburbs
.Taxing the very wealth a tiny bit = The Soviet Union
.Saying Black Lives Matter = White genocide
It's not actual a nasty character assassination is it. Firslty it's not a character assassination if the person said something transphobic but ok lets just say for argument sake what she said wasn't transphobic and she is now being unfairly being labelled a transphobe, what's the negative here ?
We live in a society that uses brutal violence on trans people in particular black trans women, people have made whole careers out of being arseholes to trans people, there is a constant effort to stop trans people being able to get the healthcare and legal rights they need. Martina Navratilova will still have all her money, mostly likely have her gig at the BBC and will be able to function in a society that on the whole agrees with her views.