Why do native speakers often confuse 'object to doing something' with 'object to do something'?

Native speakers often confuse «object to doing something» with «object to do something» because «to» in «object to» is a preposition, and prepositions are followed by a noun or a pronoun. forum.wordreference.com www.masteringgrammar.com «Doing» is a noun, while «do» is neither a noun nor a pronoun. forum.wordreference.com