It's important to be careful with our definitions. Hedonism in everyday language refers to minimizing pain and maximizing pleasure, with those two words defined imprecisely. The fact that people may derive utility from experiencing pain, both directly (enjoying pain signals themselves) or indirectly (choosing to suffer pain for some "greater good," like a sacrifice for a family member), is usually ignored in the everyday definition of hedonism. Of course, if we define hedonism to mean "people should do what they decide is the best thing for them to do," then it's a fairly obvious thing to support, mainly because it's impossible for a human to do otherwise because of the definitions of "should" and "best."