NEW CAR and new issues

My dad came through for me! He got me a car! Now I can go on with the next leg of my journey of my life! It doesn't look like much, but the ride is wonderful. My mechanic uncle is fixing some issues today, and it will be here this weekend. My dad is even covering the insurance for me until I can get on my feet. I am blessed!

With the happiness, comes something else... My step-dad gave me a lecture of how he had to work for everything, and he's glad that I got what I "wanted" and how lucky I am. My mom (who has been financially helping me), gave me a lecture of how I won't be "tooling around," (my words, not hers) and I should be looking for work. I knew not everyone would be as excited as I am about getting a car, but how do I deal with those that give me lectures that are unneeded? I know I need to work. I know I'm blessed and lucky. I know and am grateful for everything everyone can do to help me. I don't want to be rude to my step-dad and mom, because that would be inappropriate, but should I say something or let it go? I did tell my step-dad: "If I want your opinion or advice, I'll ask for it. Don't judge until you've walked in my shoes." I didn't say it meanly, just plainly. My step-dad has been against my mom helping me at all. He thinks it's enabling me. 

**Just to vent: when my step-dad has been in the middle of a messy divorce, is raising a 4 year old daughter without any help from the father, is out of work, has past experiences like mine (not positive-but learning experiences), and has no resources to live; THEN he can talk about his opinions.  There, just had to get that off my chest. I've been bottling that up for a couple days now.

How do I deal with this new situation? I don't need these opinions, but I can't be rude. (Because that would be just, well, rude.) lol.