Chaser: someone who fetishizes trans or other non hetero-normative people and pursues them as sexual objects.
Erasure refers to the deliberate or unintentional removal, omission, or invalidation of LGBTQIA+(though it can apply to any marginalized group really) identities, histories, and contributions from cultural, social, and institutional recognition.
Op is joking this post is ‘chaser erasure’ because it does not depict someone exhibiting that behavior and instead shows someone claiming they do not want to sleep with trans people.