Trendercore is an aesthetic coined by uwumars on Tumblr, dedicated to transgender and non-binary self-love. The aesthetic centers around self-love, self-acceptance, bright colors, and social justice. There is an emphasis on embracing aesthetic and physical traits in transgender individuals that truscum often attack as being indicative of being a "transtrender," the act of pretending to be transgender for attention.
However, not every transgender or nonbinary person will have debilitating gender dysphoria that constantly wrecks havoc on their lives. Some trans people love their bodies in every shape and form, but would feel comfortable with another gender than their assigned one at birth and that's ok. Some trans men wear crop tops, some trans women wear traditionally masculine clothes, and that's ok as well. The only thing that matters is that you respect their gender identities.