A phobia is an irrational fear.
A phobia is defined as an irrational fear
or aversion to something. We, very conveniently, like to leave the "aversion" part out when defining this word. An aversion is a strong dislike of or disinclination to something. Anyone doubting that can google it. These are dictionary definitions.
Sometimes, people can strongly dislike something without being afraid of it. And, in this instance, these aversions become obvious when an individual politicizes someone else's experiences or opinions and tries to bring up an argument that is unrelated but also dehumanizes that person's existence.
However, in a thread about a state law being debated (something the OP characterized as "bigotry from politicians"), one should expect that people on both sides will weigh in with their opinions. That is perfectly appropriate because this is an issue that affects all of society.
I would be inclined to agree if the thread in question wasn't about how the OP was responding to a careless comment made by the politician arguing for these state laws. In this case, nobody is arguing about the state laws being proposed. They're talking about a statement that they find harmful; if I am not mistaken it is about a mother who would "prefer" her child to be suicidal than for them to have gender reaffirming surgeries available to them.
Just as you are entitled to your view on the matter, trans people are entitled to their offense… considering that some of them
actually are suicidal as a result of gender affirming treatments not being available to them or being taken away from them. That statement can, clearly, be triggering to trans people. And that is just as valid as your opinion on the matter.