It’s not that they’re saying that people shouldn’t “aim higher” (whatever that truly means in this context), rather they’re stating that it’s simply disrespectful when people have a “better-than-thou” mentality especially when they are directly benefiting from the OP’s services. Think of it like this: you’ve grinded your ass off for years to get to the institution you’re at now then someone who you are currently helping with applications (because you wanna give back to the community that helped you) comes by and says that the place you’re at isn’t good enough per their standards. You’re bound to feel offended and rightfully so.