Draco Malfoy: He went to Durmstrang instead of Hogwarts (which was discussed before he was 11 and we all know what they chose). So he never really met or was very antagonistic to the Gryff Trio. And since he had never asked for Potter's hand and got refused (pwned!), he had no anger toward them, just that he was better. Lol. Though he was at Hogwarts during Year 4 during the Trwizard Tournament. It's also possible he could have been best mates with Krum, though maybe raised eyebrows at the part of dating Hermione.
Mordred: Hm, not sure about his. Maybe he wasn't raised by Druids? Maybe as an infant he was separated from them and.. found by a widowed knight. Who raised him as his own. Oh, that sounds interesting. So he was raised as a noble, but confused about why he had special abilities. Which were secret from everyone, though there were a couple close calls.