Well, if enough people object to the FSF's views, the growth of the organisation and its influence will be self-limiting, although the campaigns that seem to annoy some people seem fairly innocuous: spelling out the disadvantages to society and the end-user about things like DRM and various control features in, say, Windows is really only about telling people things that they may (or may not) want to hear.
Of course you will always get people who will claim "brainwashing" and that people are somehow tricked into supporting such organisations. Again, this is a laughable assertion when hundreds of millions of people probably have to listen to the Windows jingle every day using products (and being shown advertisements) made by an industry that has systematically reduced choice over the last two decades, with most of these people living in societies where brand loyalty is regarded more highly than objective consideration of any particular set of issues.