I hate to be That Guy who hinges an argument on Dictionary.com (it's lazy and closed off to subtleties); though I think in this instance it actually clarifies this most ridiculous claim that raping another human being equates to inserting things into cows and eating them.
rape1 [reyp] Show IPA noun, verb, raped, rap·ing.
Now The Vegan may (I'm being very generous here) have grounds to use the term when considering definitions 4 & 5 (forcible seizure, basically). But this still does not equate Rape, as forced sexual intercourse with a Human Being, with Rape 4 & 5, afigurative and literary description of force in general.
There is a real reason why words have multiple definitions. It's pretty insincere to equate acts that share the same word yet are flexible with meaning. One can use strength or drugs to Force sex, and another can use The Force to move objects with their mind and vaguely read the future.
Do the different uses of Force share a common denominator? Yes, imposing will/power/strength. Do they mean the exact same thing? No, of course not.
But even if we give The Vegan that, they should be careful about condemning theforcible plunder variation of the word. Agriculture, whether "local" or not (and let's face it, more than a majority of vegans do not solely consume their veggies from plots of land that sustainably grow in season), is responsible for most of the "plunder" worldwide. To clear land for crops, countless animal/insect species have went extinct. Countless more are killed everyday in that process. The soil itself must be plundered, denying millions of "potential lives" at conception.
Bottom Line: You cannot have life without death. There is nothing cruelty-free about being Vegan. Factory Farming may be unnecessarily mean-spirited, bad for our health, and bad for the environment--but The Vegan is really arguing the essence of the matter: Human beings have a moral obligation to not kill, plunder, "rape", any sentient being for sustenance.
That however, is impossible.