You are using guy logic on woman, life doesn't work that way. There's a fine line between compliments and being a nasty little creep in a womans mind. "you got gorgeous eyes" is a compliment, "i would **** you any day/ nice tits" is the creeper side of things. Same goes for your irl vs inet example. Thinking something is one side of the story, but writing "hey i would love banging you" is something you wouldn't do irl, so why does it become perfectly fine to you online? And please don't try telling me you go up to girls irl and call them a milf, you would have lost all your teeth by now. Like i get it, guys feel complimented if a girl would say dirty **** like "nice ****", woman simply dont work like us.
tl:dr; That you don't understand someones reasoning, doesn't mean you are right.