In the history of modern science (from the middle of the 20th century), I do not know of such examples. In science, in principle, it is not customary to ridicule or insult someone for an alternative scientific point of view. Certainly, such a phenomenon is not widespread, except perhaps by individual scientists, but this is not a trend.
But in any case, I do not remember such a case over the past 70 years that a marginal point of view suddenly turns out to be correct. Usually the theory that is pushed by the majority turns out to be correct.
Quite often. Understand that there are thousands of critics for any theory, among them there will always be a crowd of those who will sink everything to the bottom and bring it to the point where it makes no sense. Everyone has their own thinking in essence. But herd principles are popular in science as well. It depends on what level.