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.
lump someone and someone else together
and lump something and something else togetherto classify people or things as members of the same category. You just can't lump Bill and Ted together. They are totally different kinds of people. I tend to lump apples and oranges together.