No because Sun does not understand what "no" means.

Ongsa said that she didn't want to do the scholarship program with her and Sun took it the worst possible way:

Then Ongsa was upset that Sun just outed not just their relationship but also that she is not straight to her parents, Sun was immediately defensive and made it about her:

But let's also look at not their literally just started relationship.

Sun decided that Aylin gets hugged because "that's what friends do" even though it's very clearly not what Aylin does.

When Ongsa was still "Earth" and Sun asked Earth to meet up she always said it was fine if he couldn't but would become bitter when Earth never showed up.

Sun is so lost in her own self that she should not be in any relationship. She needs to learn to be a partner and listen when her partner expresses a concern or a hurt. Sun doesn't get to decide that someone's reaction to her actions are more painful and worse. She doesn't get to unilaterally decide things about her relationships with people and be upset when people disagree. She loves Ongsa but she sure doesn't like her enough to actually learn anything about her. Like...oh I don't know...how comfortable Ongsa is with being out. Or anything about her relationship with her parents.

It is okay to be ready for different things at different times. It is not okay to decide someone else's readiness for them and be upset when they're not actually there yet.