"I have no doubt that there are genuine trans-people."
Who are these "genuine trans people" though? There are males and especially females who suffer from body dysmorphia, and believe part of their body should be removed or altered. There are also people who genuinely believe they are the opposite sex stuck in the wrong body. However, both of these feelings/convictions are a result of faulty thinking/reasoning, the underlying cause for these beliefs needs to be addressed.
For example one of the effects of child abuse can be to develop a revulsion with the body, particularly the genitals. Another cause for girls specifically believing they are the opposite sex, is they are now growing up in a culture where females are expected to be highly sexualised. Many girls do not feel this represents who they are, and so feel they must be male.
Moreover, those who believe they are the opposite sex have rigid thinking about the sex roles, and think if they like particular activities, clothes etc, that makes them the opposite sex. Young children and especially autistic people tend to have rigid thinking, which is why they in particular can easily think they are "trans". Then there is the internalised homophobia element, where it is more acceptable to think of oneself as being stuck in the wrong body then homosexual.
I do not think any of the above makes one a "genuine trans"; which is a product of an ideology. In fact I think it is doing a great disservice to survivors of child abuse, girls who do not want to be sexualised, children, autistic people and homosexuals to confirm they are indeed stuck in the wrong body: "trans". Furthermore, one can only believe "genuine trans" exists, if one buys into the ideology that either "brain sex" or a female/male soul or essence exists that overrides biological sex. Both of these ideological beliefs are of course anti feminist, so no feminist can really believe in "genuine trans" in my opinion, only in "feminine" men and "masculine" women.