Earlier quoted context omitted.
The difference is that believers in homeopathy don't employ anything resembling the scientific method, and there's plenty of evidence against its validity. Social researchers absolutely do use the scientific method, and you don't have any evidence against the validity of their results (obviously, some are wrong -- just as in medicine -- but the field as a whole is serious and as rigorous as possible).
Just as I was preparing to answer your comment about physicists, you edited it. But wow, is this really your argument - "disprove the results or they are considered valid"? Ever heard of Russel's teapot? Using the method is nice, but let me know when they learn to reliably predict anything, such as election outcomes.
I'm not saying you should consider every social research result valid, but you cannot dismiss a discipline that employs rigorous observation and the scientific method by employing nothing of even remotely similar rigor. The burden of proof is on social researchers, but they have carried it as much as mathematically possible at present. What you cannot do is ignore the evidence by closing your eyes and saying it doesn't exist, or by picking bad apples as example. It's like an evolution denier saying that evolution is bogus because there are no fossils or whatever, and citing as evidence some cases of fake fossils.