He is not just a bit thoughtless, but if you want him like that in this universe that is ok. But you need to accept the fact that in this universe Harry is beinng inconsiderate and absolutly puts his own selfish needs and Dracos whining over his friends. He permanently insults Hermiones intelligence, painting her as stupid and putting her down, so that it is a wonder that she even wants to be friends with him anylonger. Exploring this selfish side of his character in a universe is ok - once again - but don´t defend him as being just a "little" thoughtless