I'm not a mushroom "hater" - I rather wish I did like them more than I do. In fact, when I'm cooking for myself, I'm happy to use mushrooms in my cooking - but I don't like mushroom dishes, as such.
But the key word in your post is "choose": vegetarians are never going to be getting anywhere near the same experience in a restaurant if there is no choice - and, all too often, with one menu choice versus the several-to-dozens their carnivorous colleagues might have, there
is no choice.
And if that one choice is mushrooms, then it's no choice!
I am quite relieved that the rise of the "cheesy portobello mushroom" as sole veggie choice (replacing the previous incumbent, the goat's cheese and onion tart) seems to have been averted