I admit I must be a ‘transphobic bigot’ because I never look at non-binary gender websites so as to use the correct preferred pronoun

Which is why we keep telling you to use 'they' as a default, until you know the preferred pronoun.
What makes someone a bigot, racist, sexist, xenophobe, homophobic, transphobic, ageist etc is intent or knowledge.
You don't intend to be any of those. But knowing that it is wrong to mislabel or use the wrong pronoun, you have stated you won't because it is against your grammatical code. Society has decided it fits into our language.
Transgender and non-binary gender persons are becoming more mainstream and open about their identity, so you will, even if you don't know it, be seeing them everywhere you are online and IRL.
I think everyone is over this conversation.
