Unfortunately, many, many people will offer their opinion about your child's chances of getting accepted into a top college. These people are typically other parents who have "heard" some fact or rumor about a college's acceptance policies or a high school counselor who tries to lower a family's expectations.
Over the years, I have heard so many wrong facts and total misconceptions about how the process works that I often advise trying not to talk to other parents about the process. Of course, friends can be supportive, but they don't know your child or their potential, so please take everything you hear with a grain of salt. In fact, if you ever have a question about a college's policies, you can always call the admissions office and ask!
Additionally, while I used to be a public and private school teacher and have a great respect for many high school counselors, I also know that their good intentions can be a bit misplaced. Why anyone would tell a student that they "can't" do something or "won't get in" boggles my mind. While it is true that not every student can get accepted into every college, I have found that students often start coming into their own as high school progresses. Consequently, it is unfair to judge them based on their academic performance in 9th and 10th grade without knowing anything else about them.