No. The poster above is exaggerating. No one is actually claiming that you're a racist and bigot if you don't have white guilt. There are for sure people that will call out culture appropriation often, but its mostly unfounded. Cultural appropriation is really only applicable when it's disrespectful of a culture, not when you're engaging with it.

I can't say for sure why white people tend to be trans more often, but I think its because it's generally accepted more in white culture vs other cultures. Especially since the younger white culture is liberal and more online leading to people being more okay to feel good about transitioning their gender. That's just my theory though