I've been through that, except in some respects it's much worse. My dad is HEAVILY into r/c planes and would want nothing more than to just see me flying planes and no cars.
He would frequently complain about how much money i'm spending on the cars, meanwhile we'd have like 8 fully ready to fly airplanes laying around that add up to a lot more money than my cars. This would drive me CRAZY since it's so freaking hypocritical, and I can remember a few full on arguments with me yelling at him for being so biased.
While he has settled down and really hasn't complained about my cars for awhile now, I know he still has no love for them. Worse thing is he has the impression all r/c car racers are a bunch of stuckup assholes. A few years ago I tried to get into racing and my dad wanted to "support" me. So he went to the track with me, given i'm SUPER shy, I never ended up running the car and my dad did all the talking. I guess we went to the wrong track judging by his impressions of the racers and their friendliness.
Since i'm an adult now, he really can't complain all that much anymore. But I do get an occasional, "you should start flying pattern more since they're a great bunch of people and they accept you in their group unlike car racers." I just tell him he's gotten the wrong impression of racers and pattern people are just as cliqish as racers. He just doesn't realize it since he's in the clique.
I remember many trips to the LHS when I got my electric TC3 that I got ripped off on. The hobby shop was kind enough to give me any spare parts laying around if I needed it. Not to mention, two veteran racers were kind enough to take out 20 minutes of their prep time with their own cars and wire up my ESC since I couldn't figure that out. And believe me, the job they did wasn't an easy task.