On the other hand, whilst hedonists may shirk some responsibilities, perhaps their focus on pleasure also ends up improving their ability at finding pleasure in the situations they find themselves in. If you intend to find pleasure, you may find it easier to recognise the opportunities to create it when they arise.
So to go back to your example of looking after parents when they get old, perhaps a hedonist would be resistant if that involved acting as a servant, but may be good company for them by playing games, telling stories, etc... Not all acts of compassion require self-sacrifice.
On the other hand, whilst hedonists may shirk some responsibilities, perhaps their focus on pleasure also ends up improving their ability at finding pleasure in the situations they find themselves in. If you intend to find pleasure, you may find it easier to recognise the opportunities to create it when they arise.
So to go back to your example of looking after parents when they get old, perhaps a hedonist would be resistant if that involved acting as a servant, but may be good company for them by playing games, telling stories, etc... Not all acts of compassion require self-sacrifice.