Just do research. Know that most hate comes from ignorance and/or misinformation. Take the time to learn about trans people, their stories, their history, and even find the masses of scientific data that actually backs up trans people's existence. Transphobes like the excuse of "basic biology" but many of them forget that "basic" means "simplified" so they don't actually know as much as they think they do.
Tldr, educate yourself, find empathy and learn about trans people. Then they won't seem so scary.