I would politely suggest to them that if the occasional aircraft causes them so much upset,with everything else going on in the world at the moment,then they are fortunate indeed to have to look so hard for someting to worry about.Most of the rest of the planet have no such luxury.
In answer to the question,I would simply tell them that my flying will lead to me being an airline pilot in the near future and that they will be more than happy to use my services then,regardless of the noise my airliner makes as it takes off over deprived inner city areas where most people can't afford to go abroad,and therefore should not be subject to the noise of other people using planes for their own pleasure...which after all is what airline passengers in the main are doing..using a plane for personal pleasure.
"What about flyers who don't want to go professional?why should we put up with them?"...Because 90 percent of the people who teach them to fly will end up going on to haul your ass on holiday and without customers,NO PILOTS!!
It's quite staggering actually how many people think Airline piilots are trained in simulators and not in the "small,buzzy,dangerous things".