How egregious of an error is it to use 'lo' instead of 'le' or vice-versa (for example, saying 'yo le veo' instead of 'yo lo veo')?
In other words, is this more notable of an error than using the wrong gender for a noun? Sometimes I notice that native Spanish speakers confuse the two, but I'm not sure how 'wrong' it sounds to other native speakers.
I would also like to know how silly I sound to others when I make little errors like this. Thanks!