Lisa USED to be mocked. Then, while Flanders became a joke rather than an upstanding neighbor that Homer simply didn't like because of his own insecurities and envy, Lisa became a paragon of to what one should aspire. You can watch the shift in the Overton window as the jews took over the daily showrunning. Specifically Flanders became mocked when Oakley and Weinstein took over, then the four seasons after they left to do Mission Hill Lisa was pushed as the liberal stereotype which was the only acceptable viewpoint.