Most airline seats are made to recline, therefore people do have the right to recline them, although it can seem inconsiderate at times (notably for meals - I think it should be up to the cabin crew to ensure all seats are upright for meal service). To my mind, if you are seriously uncomfortable, you should have the right to ask someone to give you a bit more room. I personally always ask the person behind me if they mind if I recline my seat (especially on the return night flight) and have yet to have anyone say they do mind.
The bottom line is that many charter operators try to squeeze more people in than is generally comfortably, but there are exceptions, notably the new First Choice planes. So, if seat pitch is likely to be an issue for you, it is worth looking up the better operators in this area.
We find that people can be inconsiderate in a thousand different ways, but there are few that have any real impact on our holiday, so we try to put them out of our mind.
This remains a valid debate, but let's keep it respectful of everyone's rights to recline or not, as the case may be.