Yes - at the risk of someone misinterpreting them as my opinions in order to discredit my arguments, or leaping to the conclusion that I am saying all these things are offensive in the same way and to the same degree - there are numerous examples.
No there are not 'numerous examples. None of those examples involve actively lying in order not to offend. All those examples involve opinions that you can not voice, not facts. You yourself said that you don't believe humans can change sex but that you wouldn't say that because it would upset people. You are willing to lie in order not to offend. Some people are not willing to partake in this lie, but are being forced to.
To give another example.
It would be homophobic to say that two men having sex is 'disgusting' or 'wrong' or 'sinful'.
It would not be homophobic to say that two men cannot make a baby on their own without a woman in the mix, it's fact.
Saying men can't be women is fact.