I got to disagree with the first one you said about Sandy, its called a swimsuit. I even watched that show as a child, and I didn't think it was a bad influence for me.
I agree with number three. Three year olds watch Spongebob. Do they really need to see a squirrel in her underpants? And yes, Patrick is dumb, but Spongebob hasn't appeared to be much smarter in many cases. They both enjoy dancing with people in giant peanut suits, and neither of them have caught on to the fact that Squidward hates their guts. I agree it's a bad influence for younger children. However, I find it hillarious. xD