I think If I told Pterano, "I think you're pretty" he might find that strange coming out of a guy. (whether I was human or a pteranodon), wouldn't he? I think he'd get a little wide-eyed and say, "Well, um...thank you."
He might not think it's strange. It is possible that male pteranodons may have showed off to one another, particularly their crests, a way of saying "I have the biggest crest!". If that's the way it worked in LBT, Pterano might have gotten used to getting compliments from both males and females.