My feelings on this are complex. I can see the tendency to deal with conflict (and there would be a lot of conflict in Harry dating someone who has prejudices against the Weasleys and Hermione). I would rather see those dealt with than for the author to say that no one reacted negatively to Draco at all. But as you say, it can go wrong so easily. And it's very easy to go for the OOC melodramatic behavior of shouting and hexing rather than silent treatment, tearful arguments, or rifts that get repaired, which we actually see happening in canon.