Regulus looked at the hand stretched toward him, and then back up to Junior. "I will call you Potter if at all. Al sounds like some sort of Muggle dog food and I'd rather be dead that call anyone Albus. In fact, I'm perfectly happy with never calling you again." Of course there might be a few insults that would be appropriate.
He raised his gloved hands. "You don't shake hands with people with gloves. Really, in what sty did you grow up?" Moving past the insipid boy, he looked at Severus. "Are we ready to go?"