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Related to lump together: poo-pooing
lump (someone or something) together
To put or categorize someone or something in the same manner or group as someone or something else, especially in a careless, hasty, or indiscriminately. Just because I've dabbled in drugs and alcohol doesn't mean I deserve to be lumped together with those degenerates. Kids, please don't lump all these clothes together before they go in the wash—separate out lights and darks! I don't think it's a good idea lumping these two groups of kids together.
To put people or things in the same group or category indiscriminately: The teacher lumped the puzzles and the books together in the toy box. Those students are friends, but I wouldn't lump them together in the same clique.