I mean... if this dude is more concerned about people making g fun of him than he is about his companions' safety, why did he even bother to heal them?
His first thought is to run away from any problem, and freeze up at the thought of being teased about his clothes; why not just let the slaves die?
It's not like you actually give a shit a out them, other than as objects... oh, unless they exhibit feelings, or exist as females; then you have to shriek like a howler monkey and run away.
I mean, if this guy really does get traumatized by (according to all precious chapters):
Thinking about being teased,
Seeing mammary glands,
Thinking about strangers not interacting at the lowest level of communication,
Thinking about sex,
Monsters, and
Wearing clothes that don't look like every other persons' clothes
Since these things have caused him (again, according to every chapter thus fucking far) unresolvable damage, I cannot for a minute imagine that he is capable of giving a single shit about any other human except himself.
So healing a slave is a little weird, and treating slaves as though they are thinking, feeling beings is just... ludicrous.
You don't have these reactions without the supporting reasons, and those reasons preclude being able to recognize others as equals.
.....
Or, perhaps, this writer is simply an idiot.