Getting $25k for a car from mom and dad, buying a $45k car just out of college, not buying a particular car because a family member already owns it. Especially the last one, it sounds petty and immature.
These things are extremely out of the norm. Considering the current unemployment rate for new college grads, the average student loan debt, etc the OP is far outpacing his peers by dropping that much cash on a car. That, combined with how he presented it to us is off putting for a lot of people.
If I were the OP i would have said "here are the cars I am looking at, here are my requirements, and here is my budget." There is no need for all that extra fluff. Then comes the question of why he included that information in the first place when it was irrelevant. Why did people need to know he was getting $25k from his parents and/or that it is a college graduation gift? They didn't. But he put it in there anyways. It shouldn't be surprising that some people viewed it in a negative light.
so what part of any of that is grandstanding?
he didn't present anything, he just said he's looking to get a new car and started talking about it. What if he was 45? Would that make his post acceptable?
did he even have to pay tuition? how do you know he doesn't have a job lined up right now?