Every group of people has idiots. Their behaviour cannot and should not be used to as representative of the entire group and as justification to denounce that group.
Correct.
Which is why there are multiple threads on mumsnet concerned about a group of people who were biologically male at birth jumping onto the trans wagon in order to invade women's spaces, take over the definition of women, shut women up. It's why there are concerns about people born biologically male, claiming to be women and then gaining access to spaces where they can display aggression towards women.
As many threads state quite clearly, most people have absolutely no issue with trans people but they do have a massive issue with self ID and the way that aggressive male behaviour is used to intimidate others. This video demonstrates that such people exist.