There are a large number of scholars of hadith who labeled Numaan bin Thaabit (Abu Hanifah) weak in hadith. They get accused for bigotry. They do not get accused for bigotry when they label others weak.
Hanafi fanaticism at its best.
But you can understand their frustration. One of the criteria for being an Imaam is to be able to tell an authentic hadith from a weak one. If they admit what the majority of scholars have to say about Numaan bin Thaabit, then he fails to fulfill the criteria.