So, just science being science then? Disagreements have always been a part of science, and always will be. The only important factor is how they are handled. Think a study is flawed? Repeat it, and change the flaws to see if the results differ significantly. But openly discrediting any evidence (for or against a case) without testing is as unscientific as it gets. I believe the person at the end also has a point: yeah, we don't know if microplastics are as bad as they say, but better safe than sorry.