I... was kind of exclusively referring to Cyrus' empathy and sympathy for Lance.
You do make a valid point, though! And thinking about it further; the times Lance is brought up around Cyrus, the story seems to indicate that he doesn't really hate Lance (especially after getting his memories back, which rather changed his perspective--i.e. the comment to Aaron about not being angry at Current/Resoom anymore for the past couple centuries), but rather just has a lingering sense of betrayal.
That's why I was referring to an issue of empathy; living as long as he has may nullify any hostility towards Lance, not to mention (it's hard to get an idea of the time frame), but weeks or months seem to have passed since Cyrus joined the Resistance, so he's having time to come to terms with and learn more about Lance and his past, but the pain is still very fresh.
Ultimately though, I suspect given enough time, both Cyrus and Lance will come around. This story is about the two of them after all.