As annoying as Dal can be, I'd hardly call hostility towards some one who helped enslave you, your friends and many others random (or "random-assed").
That particular phrasing actually stems from the fact that
a) he and Gwyn had an initial relationship that was more complicated than simple contempt, which was a more interesting choice for me than Dal simply blaming his own mistakes on her (
"you've stranded us all," really, Dal?
who landed the fucking ship on Murder Planet, again?), and which evaporated for reasons I'm unclear on unless Dal is only friendly to people when it directly benefits him, and
b) Gwyn is present because he kidnapped her as insurance against the Diviner[*] who is chasing them, and the couple of occurrences of "let's just leave her to die" in this episode didn't make sense on this rationale.
Again, these are all choices that are
consistent with his backstory in certain ways. People aren't always rational or their best possible selves and Gwyn was pretty much the kapo of a labor camp. I could see any amount of unpleasant feelings persisting. They're just not enjoyable choices for me on account of the dickishness; the Dal we met in the opener was a better dude.
I
was glad to see some of that more textured relationship come back in during this ep, though, and Dal evolving past just being a dick and actually showing signs of caring about the others beyond their relevance to his own survival. Gwyn being an actual willing part of the crew now should obviate a lot of this.
[*] Not sure I'm accurately remembering the reason for kidnapping Gwyn, now that I think on it. I'll have to rewatch the opener at some point...
