It's important to defend how you feel about things, but is it worth upsetting someone you care about or making an important person mad? If the person you disagree with can't be big enough to accept your position, then you have to be big enough to accept theirs: but you don't have to agree with it. You can't always surround yourself with like-minded people only. Not only is it boring, it's a small way of seeing the world. Disagreements can be very educational.