There are jeans and there is denim. Same but different. Like with everything it’s not the actual clothing but who is wearing it, why they’re wearing what they are and how the clothing is worn.
Most important is not to judge someone by how he dresses. Some people dress to make a statement, some to feel comfortable and some because it is appropriate at that time to dress in a certain manner.
It’s all relative but at the same time one needs to stay focused on how a religious Jew should dress and present themselves.