Draco had never seen a picture of Andromeda long enough to even have the vaguest recollection of what she looked like; let alone her grandson. For all Draco knew, the woman and child were simply another witch and boy-wizard (one would hope) preparing for a day of shopping.
That is not to say, however, that Draco was unaware of the woman’s response to his presence. He assumed it was because of who he was and the well-known public dislike and distinct distrust of the Malfoy family since the end of the war. Draco, had he been in a better mood, might have simply shrugged her reaction off and let it fall by the wayside unresponded; however, Draco was not in such a mood and therefore looked at the woman and narrowed his eyes before he addressed her.
“Yes. I am Draco Malfoy. Is that a problem for you?” He drawled slowly and coolly, completely ignoring the bartender as he set the woman’s coffee on the bar in front of her and turned to fetch Draco’s tea.