gee, you're sooo cool because your grandpa has a porche! you sound like Tanner...driving REAL race cars on REAL race tracks!
and that's not been my experience at all. i've got an uncle who collects & races porches as well and everyone i've ever met through him has never been a hater just because someone else builds a different car. in fact, most have been stoked to see younger kids sharing their passion of racing. most kids can't afford to build a porche, so they build something closer to their budget. that doesn't make them an less of a "racer" than your grandpa. that just makes you an elitist fucking douche bag.
unless, of course, you're referring to the retards that throw on a $100 autozone fart can, a few stickers, and think they drive a race car. in which case, yeah, everybody makes fun of them.