In one kid show "She-Ra" for example, every relationship is gay/lesbian save for one. I cannot prove harm in any meaningful way, but I think this sort of misrepresentation of reality is very confusing to kids.
Seriously?
Now, when She-Ra starts having extended monologues about taxation policy or the virtues of direct democracy vs. representative government, I’ll support ya!
(I'm not joking, that's canon.)