^And as "Evil Flash" in Elseworlds.
I think Oliver was too focused on the Earth-X Nazi version of himself who is married to Kara's doppelganger, probably thinking the same as Kara did with her subtle reaction, "Ew, gross! No offense."
But back to Thawne, yeah, Oliver either didn't remember him (doubtful) or didn't dwell too much on that as he was an enemy Barry can handle.